CVE-2026-6752

HIGHPre-NVD 7.37.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 7.3 from GitHub Security Advisory (severity: HIGH) published 2026-04-21. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — 4 sources updated this week

Also known asEUVD-2026-24093 (ENISA EUVD) · GHSA-5wvf-8jjj-7w99 (GitHub Security Advisories)Source: ENISA EUVD

7.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

CVSS v3
7.3
EG Score
7.3HIGHmedium confidence
EG Risk
33
EG Risk 33/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity73% × 45%
Impact severity (EG Severity): CVSS 7.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
23rd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.3): severity, escalated by confirmed exploitation. This CVE's 7.3 is its impact severity (EG Severity), not escalated.

EG Severity
7.3 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-25). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

April 21, 2026

Last Modified

October 25, 2026

Advisory Details (6)

Auto-updated Jun 11, 2026
Patch available.
Web page

Security Vulnerabilities fixed in Thunderbird 140.10 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-34/
Web page

Security Vulnerabilities fixed in Thunderbird 150 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-33/
Web page

Security Vulnerabilities fixed in Firefox ESR 140.10 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-32/
Web page

Security Vulnerabilities fixed in Firefox ESR 115.35 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-31/
Web page

Security Vulnerabilities fixed in Firefox 150 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-30/

Patch Availability(27)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatthunderbird-0:140.10.0-1.el9_22026-05-20redhat
redhatthunderbird-0:140.10.0-1.el8_62026-05-20redhat
redhatthunderbird-0:140.10.0-1.el10_02026-05-20redhat
redhatfirefox-0:140.10.0-1.el8_62026-05-20redhat
redhatthunderbird-0:140.10.0-1.el9_42026-05-20redhat
redhatthunderbird-0:140.10.0-1.el8_82026-05-20redhat
redhatfirefox-0:140.10.0-1.el9_42026-05-20redhat
redhatfirefox-0:140.10.0-2.el7_92026-05-20redhat
redhatthunderbird-0:140.10.0-1.el8_42026-05-20redhat
redhatfirefox-0:140.10.0-1.el8_42026-05-20redhat
redhatthunderbird-0:140.10.0-1.el9_02026-05-20redhat
redhatthunderbird-0:140.10.0-1.el9_62026-05-20redhat
redhatfirefox-0:140.10.0-1.el10_22026-05-19redhat
redhatthunderbird-0:140.10.1-1.el9_82026-05-19redhat
redhatfirefox-0:140.10.0-1.el9_82026-05-19redhat
redhatthunderbird-0:140.10.0-1.el10_22026-05-19redhat
redhatfirefox-0:140.10.0-1.el10_02026-05-14redhat
redhatfirefox-0:140.10.0-1.el9_62026-05-14redhat
redhatfirefox-0:140.10.0-1.el8_82026-05-14redhat
redhatfirefox-0:140.10.0-1.el9_02026-05-14redhat
redhatfirefox-0:140.10.0-1.el9_22026-05-14redhat
redhatthunderbird-0:140.10.0-1.el9_72026-05-11redhat
redhatthunderbird-0:140.10.0-1.el8_102026-05-04redhat
redhatthunderbird-0:140.10.0-1.el10_12026-04-30redhat
redhatfirefox-0:140.10.0-1.el8_102026-04-27redhat
redhatfirefox-0:140.10.0-1.el9_72026-04-27redhat
redhatfirefox-0:140.10.0-1.el10_12026-04-27redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(8 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr102.1.0esr-1 ... 91.9.1esr-1~deb9u1 (263 versions)
  • every version up to 140.10.0esr-1~deb11u1: fixed in 140.10.0esr-1~deb11u1
—
thunderbird1:102.0.1-1 ... 1:91.9.0-1~deb9u1 (314 versions)
  • every version up to 1:140.10.0esr-1~deb11u1: fixed in 1:140.10.0esr-1~deb11u1
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr102.11.0esr-1 ... 140.9.1esr-1~deb13u1 (170 versions)
  • every version up to 140.10.0esr-1~deb12u1: fixed in 140.10.0esr-1~deb12u1
—
thunderbird1:102.11.0-1 ... 1:140.9.1esr-1~deb13u1 (199 versions)
  • every version up to 1:140.10.0esr-1~deb12u1: fixed in 1:140.10.0esr-1~deb12u1
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (46 versions)
  • every version up to 140.10.0esr-1~deb13u1: fixed in 140.10.0esr-1~deb13u1
—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (55 versions)
  • every version up to 1:140.10.0esr-1~deb13u1: fixed in 1:140.10.0esr-1~deb13u1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (47 versions)
  • every version up to 140.10.0esr-1: fixed in 140.10.0esr-1
—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (56 versions)
  • every version up to 1:140.10.0esr-1: fixed in 1:140.10.0esr-1
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(7)

Data Freshness Timeline

(refreshed 11× in last 7d / 45× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 98 of 275 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 177 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  2. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  3. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  4. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  5. 2026-10-25 23:29 UTCEG score recompute
  6. 2026-10-25 23:29 UTCVendor advisory
  7. 2026-10-25 23:29 UTCGHSA enrichmentGHSA-5wvf-8jjj-7w99 · GitHub severity HIGH · GitHub CVSS 7.3
  8. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  9. 2026-10-25 14:10 UTCEG score recompute
  10. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  11. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  12. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  13. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  14. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  15. 2026-10-20 09:03 UTCEG score recompute
  16. 2026-10-20 09:03 UTCVendor advisory
  17. 2026-10-20 09:03 UTCGHSA enrichmentGHSA-5wvf-8jjj-7w99 · GitHub severity HIGH · GitHub CVSS 7.3
  18. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  19. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  20. 2026-10-18 03:20 UTCEG score recompute
  21. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  22. 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  23. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  24. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  25. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.5% · 37th percentile
Show 73 more
  1. 2026-10-13 10:23 UTCEG score recompute
  2. 2026-10-13 10:23 UTCVendor advisory
  3. 2026-10-13 10:23 UTCGHSA enrichmentGHSA-5wvf-8jjj-7w99 · GitHub severity HIGH · GitHub CVSS 7.3
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  5. 2026-10-12 15:45 UTCEG score recompute
  6. 2026-10-11 19:30 UTCEG score recompute
  7. 2026-10-11 16:46 UTCEG score recompute
  8. 2026-10-11 14:06 UTCEG score recompute
  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  17. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  18. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  19. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  21. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  22. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  23. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  24. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  25. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  26. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  27. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  28. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  29. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  30. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  31. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  32. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  33. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  34. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  35. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  36. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  37. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  38. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  39. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  40. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  41. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  42. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  43. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  44. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  45. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  46. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  47. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  48. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  49. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  50. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  51. 2026-08-18 13:49 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  52. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  53. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  54. 2026-08-16 06:20 UTCEG score recompute
  55. 2026-08-16 06:20 UTCVendor advisory
  56. 2026-08-16 06:20 UTCGHSA enrichmentGHSA-5wvf-8jjj-7w99 · GitHub severity HIGH · GitHub CVSS 7.3
  57. 2026-08-16 02:15 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  58. 2026-08-15 01:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  59. 2026-08-14 18:05 UTCVendor advisory
  60. 2026-08-14 18:05 UTCGHSA enrichmentGHSA-5wvf-8jjj-7w99 · GitHub severity HIGH · GitHub CVSS 7.3
  61. 2026-08-14 04:31 UTCEG score recompute
  62. 2026-08-14 04:31 UTCVendor advisory
  63. 2026-08-14 04:31 UTCGHSA enrichmentGHSA-5wvf-8jjj-7w99 · GitHub severity HIGH · GitHub CVSS 7.3
  64. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  65. 2026-08-13 08:47 UTCVendor advisory
  66. 2026-08-13 08:47 UTCGHSA enrichmentGHSA-5wvf-8jjj-7w99 · GitHub severity HIGH · GitHub CVSS 7.3
  67. 2026-08-12 18:41 UTCEG score recompute
  68. 2026-08-12 18:41 UTCVendor advisory
  69. 2026-08-12 18:41 UTCGHSA enrichmentGHSA-5wvf-8jjj-7w99 · GitHub severity HIGH · GitHub CVSS 7.3
  70. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  71. 2026-08-11 16:52 UTCEG score recompute
  72. 2026-08-11 16:52 UTCVendor advisory
  73. 2026-08-11 16:52 UTCGHSA enrichmentGHSA-5wvf-8jjj-7w99 · GitHub severity HIGH · GitHub CVSS 7.3

Frequently asked(5)

What is CVE-2026-6752?
CVE-2026-6752 is a high-severity vulnerability; its CVE record was published on April 21, 2026. Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
When was the CVE record for CVE-2026-6752 published?
The CVE record for CVE-2026-6752 was published on April 21, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 25, 2026; the record at its source may have been updated since.
Is CVE-2026-6752 actively exploited?
CVE-2026-6752 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (23rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-6752?
CVE-2026-6752 has a CVSS v3.1 base score of 7.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-6752?
A fix for CVE-2026-6752 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-6752 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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