CVE-2026-8952

HIGHNVD 8.88.8
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.4% (32nd percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 6.5 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-05-19) is not newer than that change (2026-10-14), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this week
8.8EG
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: 0.4%CVSS: 8.8Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100

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 (value × EchelonGraph’s weight)
Severity88% × 45%
The EG Score, 8.8 of 10.
Exploitation0.4% × 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 low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
32nd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

The CVE record names the fixed release. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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)14 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 total (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

May 19, 2026

Last Modified

October 14, 2026

Advisory Details (3)

Auto-updated May 20, 2026
Fix named in the CVE record.
Web page

Security Vulnerabilities fixed in Thunderbird 151 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-50/
Web page

Security Vulnerabilities fixed in Firefox 151 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-46/
Web page

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2021727

Vendor Advisories for CVE-2026-8952(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 32× 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 214 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 116 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  2. 2026-10-14 20:30 UTCEG score recompute
  3. 2026-10-14 20:30 UTCGHSA enrichmentGHSA-hrqc-vwff-62mj · GitHub CVSS 6.5
  4. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  5. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  6. 2026-10-13 04:55 UTCEG score recompute
  7. 2026-10-13 04:55 UTCGHSA enrichmentGHSA-hrqc-vwff-62mj · GitHub CVSS 6.5
  8. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  9. 2026-10-12 14:48 UTCEG score recompute
  10. 2026-10-11 19:15 UTCEG score recompute
  11. 2026-10-11 16:32 UTCEG score recompute
  12. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  13. 2026-10-11 13:47 UTCEG score recompute
  14. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  15. 2026-10-09 20:08 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  16. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  17. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  18. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  19. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  20. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  21. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  22. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  23. 2026-09-27 13:49 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  24. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  25. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 31st percentile
Show 73 more
  1. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  2. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  3. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  4. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  5. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  6. 2026-09-17 19:32 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  7. 2026-09-16 14:09 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  8. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  9. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  10. 2026-09-13 16:48 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  11. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  12. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  13. 2026-09-11 09:38 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  14. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  15. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  16. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  17. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  18. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  19. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  20. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  21. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  22. 2026-08-30 19:18 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  23. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  24. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  25. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  26. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  27. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  28. 2026-08-24 14:18 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  29. 2026-08-23 17:07 UTCEG score recompute
  30. 2026-08-23 17:07 UTCGHSA enrichmentGHSA-hrqc-vwff-62mj · GitHub CVSS 6.5
  31. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  32. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  33. 2026-08-21 23:38 UTCEG score recompute
  34. 2026-08-21 23:38 UTCGHSA enrichmentGHSA-hrqc-vwff-62mj · GitHub CVSS 6.5
  35. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  36. 2026-08-20 19:03 UTCEG score recompute
  37. 2026-08-20 19:03 UTCGHSA enrichmentGHSA-hrqc-vwff-62mj · GitHub CVSS 6.5
  38. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  39. 2026-08-18 13:49 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  40. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  41. 2026-08-17 10:01 UTCEG score recompute
  42. 2026-08-17 10:01 UTCGHSA enrichmentGHSA-hrqc-vwff-62mj · GitHub CVSS 6.5
  43. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  44. 2026-08-16 03:36 UTCEG score recompute
  45. 2026-08-16 03:36 UTCGHSA enrichmentGHSA-hrqc-vwff-62mj · GitHub CVSS 6.5
  46. 2026-08-16 02:15 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  47. 2026-08-15 01:31 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  48. 2026-08-14 15:08 UTCGHSA enrichmentGHSA-hrqc-vwff-62mj · GitHub CVSS 6.5
  49. 2026-08-14 02:07 UTCEG score recompute
  50. 2026-08-14 02:07 UTCGHSA enrichmentGHSA-hrqc-vwff-62mj · GitHub CVSS 6.5
  51. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  52. 2026-08-13 01:02 UTCEG score recompute
  53. 2026-08-13 01:02 UTCGHSA enrichmentGHSA-hrqc-vwff-62mj · GitHub CVSS 6.5
  54. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  55. 2026-08-12 12:02 UTCGHSA enrichmentGHSA-hrqc-vwff-62mj · GitHub CVSS 6.5
  56. 2026-08-11 13:54 UTCEG score recompute
  57. 2026-08-11 13:54 UTCGHSA enrichmentGHSA-hrqc-vwff-62mj · GitHub CVSS 6.5
  58. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  59. 2026-08-11 00:39 UTCEG score recompute
  60. 2026-08-11 00:39 UTCGHSA enrichmentGHSA-hrqc-vwff-62mj · GitHub CVSS 6.5
  61. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  62. 2026-08-10 03:37 UTCGHSA enrichmentGHSA-hrqc-vwff-62mj · GitHub CVSS 6.5
  63. 2026-08-09 14:37 UTCEG score recompute
  64. 2026-08-09 14:37 UTCGHSA enrichmentGHSA-hrqc-vwff-62mj · GitHub CVSS 6.5
  65. 2026-08-09 13:47 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  66. 2026-08-09 01:37 UTCEG score recompute
  67. 2026-08-09 01:37 UTCGHSA enrichmentGHSA-hrqc-vwff-62mj · GitHub CVSS 6.5
  68. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  69. 2026-08-08 03:10 UTCEG score recompute
  70. 2026-08-08 03:10 UTCGHSA enrichmentGHSA-hrqc-vwff-62mj · GitHub CVSS 6.5
  71. 2026-08-07 16:30 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  72. 2026-08-07 14:10 UTCGHSA enrichmentGHSA-hrqc-vwff-62mj · GitHub CVSS 6.5
  73. 2026-08-07 01:11 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-8952?
CVE-2026-8952 is a high-severity vulnerability; its CVE record was published on May 19, 2026. Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
When was the CVE record for CVE-2026-8952 published?
The CVE record for CVE-2026-8952 was published on May 19, 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 14, 2026; the record at its source may have been updated since.
Is CVE-2026-8952 actively exploited?
CVE-2026-8952 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (32nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-8952?
CVE-2026-8952 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-8952?
The CVE record for CVE-2026-8952 names the fix: "This vulnerability was fixed in Firefox 151 and Thunderbird 151." The vendor advisories EchelonGraph has for CVE-2026-8952 are linked in the Vendor Advisories panel on this page.

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