CVE-2026-15719

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory published 2026-07-14. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

A fix is available — apply it.

We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw. This vulnerability was fixed in Firefox 152.0.6, Firefox ESR 115.38, Firefox ESR 140.13, and Thunderbird 140.13.

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

July 14, 2026

Last Modified

July 22, 2026

Advisory Details (2)

Auto-updated Jul 19, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🔴 Active Exploitation

Security Vulnerabilities fixed in Firefox 152.0.6 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-67/
generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2043820

Vendor Advisories for CVE-2026-15719(20)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(21)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatfirefox-0:140.13.0-1.el8_82026-08-12redhat
redhatfirefox-0:140.13.0-1.el8_62026-08-12redhat
redhatfirefox-0:140.13.0-1.el9_62026-08-12redhat
redhatfirefox-0:140.13.0-1.el10_02026-08-12redhat
redhatfirefox-0:140.13.0-1.el9_22026-08-12redhat
redhatfirefox-0:140.13.0-1.el9_42026-08-12redhat
redhatfirefox-0:140.13.0-1.el8_42026-08-12redhat
redhatfirefox-0:140.13.0-1.el7_92026-08-12redhat
redhatthunderbird-0:140.13.0-1.el8_82026-08-11redhat
redhatthunderbird-0:140.13.0-1.el9_42026-08-11redhat
redhatthunderbird-0:140.13.0-1.el9_22026-08-11redhat
redhatthunderbird-0:140.13.0-1.el10_02026-08-11redhat
redhatthunderbird-0:140.13.0-1.el8_62026-08-11redhat
redhatthunderbird-0:140.13.0-1.el9_62026-08-11redhat
redhatthunderbird-0:140.13.0-1.el8_42026-08-11redhat
redhatthunderbird-0:140.13.0-1.el9_82026-08-04redhat
redhatthunderbird-0:140.13.0-1.el8_102026-08-04redhat
redhatthunderbird-0:140.13.0-1.el10_22026-08-03redhat
redhatfirefox-0:140.13.0-1.el9_82026-08-03redhat
redhatfirefox-0:140.13.0-1.el8_102026-07-28redhat
redhatfirefox-0:140.13.0-1.el10_22026-07-28redhat

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 rangeFixed inDependents
firefox-esr102.1.0esr-1 ... 91.9.1esr-1~deb9u1 (283 versions)140.13.0esr-1~deb11u1—
thunderbird1:102.0.1-1 ... 1:91.9.0-1~deb9u1 (334 versions)1:140.13.0esr-1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
firefox-esr102.11.0esr-1 ... 140.9.1esr-1~deb13u1 (190 versions)140.13.0esr-1~deb12u1—
thunderbird1:102.11.0-1 ... 1:140.9.1esr-1~deb13u1 (218 versions)1:140.13.0esr-1—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (66 versions)140.13.0esr-1~deb13u1—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (76 versions)1:140.13.0esr-2~deb13u1—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (67 versions)140.13.0esr-1—
thunderbird1:128.13.0esr-1 ... 1:153.0.1esr-1 (84 versions)——

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 22× in last 7d / 115× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 150 total refreshes for this CVE.

  1. 2026-08-30 05:25 UTCEG score recompute
  2. 2026-08-30 05:25 UTCVendor advisory
  3. 2026-08-30 05:25 UTCGHSA enrichment
  4. 2026-08-30 01:22 UTCEPSS rescore
  5. 2026-08-28 21:41 UTCEPSS rescore
  6. 2026-08-28 04:50 UTCEG score recompute
  7. 2026-08-28 04:50 UTCVendor advisory
  8. 2026-08-28 04:50 UTCGHSA enrichment
  9. 2026-08-27 14:25 UTCEPSS rescore
  10. 2026-08-27 05:09 UTCEG score recompute
  11. 2026-08-27 05:09 UTCVendor advisory
  12. 2026-08-27 05:08 UTCGHSA enrichment
  13. 2026-08-26 14:46 UTCEPSS rescore
  14. 2026-08-26 04:40 UTCEG score recompute
  15. 2026-08-26 04:40 UTCVendor advisory
  16. 2026-08-26 04:40 UTCGHSA enrichment
  17. 2026-08-25 13:48 UTCEPSS rescore
  18. 2026-08-25 04:56 UTCEG score recompute
  19. 2026-08-25 04:56 UTCVendor advisory
  20. 2026-08-25 04:56 UTCGHSA enrichment
  21. 2026-08-24 05:16 UTCVendor advisory
  22. 2026-08-24 05:16 UTCGHSA enrichment
  23. 2026-08-23 05:36 UTCEG score recompute
  24. 2026-08-23 05:36 UTCVendor advisory
  25. 2026-08-23 05:36 UTCGHSA enrichment
Show 75 more
  1. 2026-08-23 00:19 UTCEPSS rescore
  2. 2026-08-22 05:56 UTCEG score recompute
  3. 2026-08-22 05:56 UTCVendor advisory
  4. 2026-08-22 05:56 UTCGHSA enrichment
  5. 2026-08-21 23:49 UTCEPSS rescore
  6. 2026-08-21 06:16 UTCEG score recompute
  7. 2026-08-21 06:16 UTCVendor advisory
  8. 2026-08-21 06:16 UTCGHSA enrichment
  9. 2026-08-20 22:55 UTCEPSS rescore
  10. 2026-08-20 06:36 UTCEG score recompute
  11. 2026-08-20 06:36 UTCVendor advisory
  12. 2026-08-20 06:36 UTCGHSA enrichment
  13. 2026-08-19 17:03 UTCEPSS rescore
  14. 2026-08-19 06:54 UTCEG score recompute
  15. 2026-08-19 06:54 UTCVendor advisory
  16. 2026-08-19 06:54 UTCGHSA enrichment
  17. 2026-08-18 13:48 UTCEPSS rescore
  18. 2026-08-18 06:36 UTCEG score recompute
  19. 2026-08-18 06:36 UTCVendor advisory
  20. 2026-08-18 06:36 UTCGHSA enrichment
  21. 2026-08-17 13:47 UTCEPSS rescore
  22. 2026-08-17 06:56 UTCEG score recompute
  23. 2026-08-17 06:56 UTCVendor advisory
  24. 2026-08-17 06:56 UTCGHSA enrichment
  25. 2026-08-16 14:56 UTCEPSS rescore
  26. 2026-08-16 07:17 UTCEG score recompute
  27. 2026-08-16 07:17 UTCVendor advisory
  28. 2026-08-16 07:17 UTCGHSA enrichment
  29. 2026-08-16 02:14 UTCEPSS rescore
  30. 2026-08-15 07:37 UTCEG score recompute
  31. 2026-08-15 07:37 UTCVendor advisory
  32. 2026-08-15 07:37 UTCGHSA enrichment
  33. 2026-08-15 01:30 UTCEPSS rescore
  34. 2026-08-14 07:07 UTCEG score recompute
  35. 2026-08-14 07:07 UTCVendor advisory
  36. 2026-08-14 07:07 UTCGHSA enrichment
  37. 2026-08-13 22:00 UTCEPSS rescore
  38. 2026-08-13 07:27 UTCEG score recompute
  39. 2026-08-13 07:27 UTCVendor advisory
  40. 2026-08-13 07:27 UTCGHSA enrichment
  41. 2026-08-12 13:50 UTCEPSS rescore
  42. 2026-08-12 07:40 UTCEG score recompute
  43. 2026-08-12 07:40 UTCVendor advisory
  44. 2026-08-12 07:39 UTCGHSA enrichment
  45. 2026-08-11 13:42 UTCEPSS rescore
  46. 2026-08-11 07:59 UTCEG score recompute
  47. 2026-08-11 07:59 UTCVendor advisory
  48. 2026-08-11 07:59 UTCGHSA enrichment
  49. 2026-08-11 00:00 UTCEPSS rescore
  50. 2026-08-10 08:19 UTCEG score recompute
  51. 2026-08-10 08:19 UTCVendor advisory
  52. 2026-08-10 08:19 UTCGHSA enrichment
  53. 2026-08-09 13:46 UTCEPSS rescore
  54. 2026-08-09 08:40 UTCEG score recompute
  55. 2026-08-09 08:40 UTCVendor advisory
  56. 2026-08-09 08:40 UTCGHSA enrichment
  57. 2026-08-08 16:37 UTCEPSS rescore
  58. 2026-08-08 09:00 UTCEG score recompute
  59. 2026-08-08 09:00 UTCVendor advisory
  60. 2026-08-08 09:00 UTCGHSA enrichment
  61. 2026-08-07 09:20 UTCEG score recompute
  62. 2026-08-07 09:20 UTCVendor advisory
  63. 2026-08-07 09:20 UTCGHSA enrichment
  64. 2026-08-06 13:46 UTCEPSS rescore
  65. 2026-08-06 09:40 UTCEG score recompute
  66. 2026-08-06 09:40 UTCVendor advisory
  67. 2026-08-06 09:40 UTCGHSA enrichment
  68. 2026-08-05 19:17 UTCEPSS rescore
  69. 2026-08-05 10:00 UTCEG score recompute
  70. 2026-08-05 10:00 UTCVendor advisory
  71. 2026-08-05 10:00 UTCGHSA enrichment
  72. 2026-08-04 15:10 UTCEPSS rescore
  73. 2026-08-04 10:38 UTCEPSS rescore
  74. 2026-08-04 10:02 UTCEG score recompute
  75. 2026-08-04 10:02 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-15719?
CVE-2026-15719 is a medium vulnerability published on July 14, 2026. We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw. This vulnerability was fixed in Firefox 152.0.6, Firefox ESR 115.38, Firefox ESR 140.13, and Thunderbird 140.13.
When was CVE-2026-15719 disclosed?
CVE-2026-15719 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15719 actively exploited?
CVE-2026-15719 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 73.5% of all scored CVEs.
What is the CVSS score of CVE-2026-15719?
CVE-2026-15719 has a CVSS v3.1 base score of 5.4 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-15719?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15719, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-15719

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