CVE-2026-16367

CRITICALPre-NVD 10.010.0
EchelonGraph scoreMEDIUM confidence

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

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-21. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — 3 sources updated this week
10.0EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 10.0Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

Sandbox escape due to invalid pointer in the Disability Access APIs component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

CVSS v3
10.0
EG Score
10.0CRITICALmedium confidence
EG Risk
60
EG Risk 60/100

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)
Severity100% × 45%
The EG Score, 10.0 of 10.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
29th
KEV
Not listed

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

The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

July 21, 2026

Last Modified

July 24, 2026

Advisory Details (3)

Auto-updated Oct 10, 2026
Fix named in the CVE record.
Web page

Security Vulnerabilities fixed in Thunderbird 153 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-71/
Web page

Security Vulnerabilities fixed in Firefox 153 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-68/
Web page

2050627 - (CVE-2026-16367) OOBR/W sandbox escape via PDocAccessible::RecvMutationEvents with inconsistent mType and mGenericTypes

https://bugzilla.mozilla.org/show_bug.cgi?id=2050627

Vendor Advisories for CVE-2026-16367(1)

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

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 16× in last 7d / 60× 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 100 of 409 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. None are among the latest 100 rows. The 309 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 13:48 UTCEG score recompute
  2. 2026-10-14 13:48 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  3. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  4. 2026-10-13 11:32 UTCEG score recompute
  5. 2026-10-13 11:32 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  6. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  7. 2026-10-12 16:30 UTCEG score recompute
  8. 2026-10-12 09:36 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  9. 2026-10-11 20:09 UTCEG score recompute
  10. 2026-10-11 17:21 UTCEG score recompute
  11. 2026-10-11 14:54 UTCEG score recompute
  12. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  13. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  14. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  15. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  16. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  17. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  18. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  19. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  20. 2026-10-04 14:51 UTCEG score recompute
  21. 2026-10-04 14:51 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  22. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  23. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  24. 2026-10-01 14:56 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  25. 2026-10-01 11:18 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
Show 75 more
  1. 2026-10-01 07:33 UTCEG score recompute
  2. 2026-10-01 07:33 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  3. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  4. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  5. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  6. 2026-09-28 13:31 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  7. 2026-09-28 09:51 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  8. 2026-09-28 06:13 UTCEG score recompute
  9. 2026-09-28 06:13 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  10. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  11. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  12. 2026-09-24 11:06 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  13. 2026-09-24 07:04 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  14. 2026-09-24 03:25 UTCEG score recompute
  15. 2026-09-24 03:25 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  16. 2026-09-23 09:12 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  17. 2026-09-23 05:24 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  18. 2026-09-23 01:29 UTCEG score recompute
  19. 2026-09-23 01:29 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  20. 2026-09-20 06:05 UTCEG score recompute
  21. 2026-09-20 06:05 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  22. 2026-09-19 00:24 UTCEG score recompute
  23. 2026-09-19 00:24 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  24. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  25. 2026-09-18 11:12 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  26. 2026-09-18 07:33 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  27. 2026-09-18 03:52 UTCEG score recompute
  28. 2026-09-18 03:52 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  29. 2026-09-17 09:53 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  30. 2026-09-17 05:07 UTCEG score recompute
  31. 2026-09-17 05:07 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  32. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  33. 2026-09-16 12:42 UTCEG score recompute
  34. 2026-09-16 12:42 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  35. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  36. 2026-09-14 09:38 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  37. 2026-09-14 05:59 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  38. 2026-09-14 02:20 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  39. 2026-09-13 22:41 UTCEG score recompute
  40. 2026-09-13 22:41 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  41. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  42. 2026-09-13 15:58 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  43. 2026-09-13 11:28 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  44. 2026-09-13 07:02 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  45. 2026-09-13 03:05 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  46. 2026-09-12 21:16 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  47. 2026-09-12 17:08 UTCEG score recompute
  48. 2026-09-12 17:08 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  49. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  50. 2026-09-12 13:28 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  51. 2026-09-12 09:49 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  52. 2026-09-12 05:48 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  53. 2026-09-12 01:03 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  54. 2026-09-11 18:18 UTCEG score recompute
  55. 2026-09-11 18:18 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  56. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  57. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  58. 2026-09-11 09:10 UTCEG score recompute
  59. 2026-09-11 09:10 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  60. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  61. 2026-09-09 11:39 UTCEG score recompute
  62. 2026-09-09 11:39 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  63. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  64. 2026-09-08 02:22 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  65. 2026-09-07 22:43 UTCEG score recompute
  66. 2026-09-07 22:43 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  67. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  68. 2026-09-06 18:52 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  69. 2026-09-06 14:48 UTCEG score recompute
  70. 2026-09-06 14:48 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  71. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  72. 2026-09-06 11:09 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  73. 2026-09-06 04:05 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  74. 2026-09-05 23:30 UTCGHSA enrichmentGHSA-856j-8v8v-wvfq · GitHub severity CRITICAL · GitHub CVSS 10.0
  75. 2026-09-05 19:51 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-16367?
CVE-2026-16367 is a critical-severity vulnerability; its CVE record was published on July 21, 2026. Sandbox escape due to invalid pointer in the Disability Access APIs component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
When was the CVE record for CVE-2026-16367 published?
The CVE record for CVE-2026-16367 was published on July 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 July 24, 2026; the record at its source may have been updated since.
Is CVE-2026-16367 actively exploited?
CVE-2026-16367 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (29th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-16367?
CVE-2026-16367 has a CVSS v3.1 base score of 10.0 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-16367?
The CVE record for CVE-2026-16367 names the fix: "This vulnerability was fixed in Firefox 153 and Thunderbird 153." The vendor advisories EchelonGraph has for CVE-2026-16367 are linked in the Vendor Advisories panel on this page.

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