CVE-2026-12315

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-16. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

A fix is available — apply it.

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

June 16, 2026

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated Aug 1, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 140.12 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-61/
generic

Security Vulnerabilities fixed in Thunderbird 152 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-60/
generic

Security Vulnerabilities fixed in Firefox ESR 140.12 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-58/
generic

Security Vulnerabilities fixed in Firefox 152 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-57/
generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2042058

Vendor Advisories for CVE-2026-12315(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
redhatthunderbird-0:140.12.0-1.el9_22026-07-15redhat
redhatthunderbird-0:140.12.0-1.el8_82026-07-14redhat
redhatthunderbird-0:140.12.0-1.el8_62026-07-14redhat
redhatthunderbird-0:140.12.0-1.el8_42026-07-14redhat
redhatthunderbird-0:140.12.0-1.el9_62026-07-13redhat
redhatfirefox-0:140.12.0-1.el7_92026-07-13redhat
redhatfirefox-0:140.12.0-1.el9_42026-07-13redhat
redhatthunderbird-0:140.12.0-1.el10_02026-07-13redhat
redhatthunderbird-0:140.12.0-1.el9_42026-07-13redhat
redhatfirefox-0:140.12.0-1.el9_62026-07-09redhat
redhatfirefox-0:140.12.0-1.el8_62026-07-09redhat
redhatfirefox-0:140.12.0-1.el10_02026-07-07redhat
redhatfirefox-0:140.12.0-1.el8_82026-07-07redhat
redhatfirefox-0:140.12.0-1.el9_22026-07-07redhat
redhatfirefox-0:140.12.0-1.el8_42026-07-07redhat
redhatthunderbird-0:140.12.0-1.el8_102026-06-30redhat
redhatthunderbird-0:140.12.0-1.el10_22026-06-29redhat
redhatthunderbird-0:140.12.0-1.el9_82026-06-25redhat
redhatfirefox-0:140.12.0-1.el10_22026-06-22redhat
redhatfirefox-0:140.12.0-1.el8_102026-06-22redhat
redhatfirefox-0:140.12.0-1.el9_82026-06-22redhat

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 (279 versions)140.12.0esr-1~deb11u1—
thunderbird1:102.0.1-1 ... 1:91.9.0-1~deb9u1 (330 versions)1:140.12.0esr-1~deb11u1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
firefox-esr102.11.0esr-1 ... 140.9.1esr-1~deb13u1 (186 versions)140.12.0esr-1~deb12u1—
thunderbird1:102.11.0-1 ... 1:140.9.1esr-1~deb13u1 (215 versions)1:140.12.0esr-1~deb12u1—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (62 versions)140.12.0esr-1~deb13u1—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (71 versions)1:140.12.0esr-1~deb13u1—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (63 versions)140.12.0esr-1—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (72 versions)1:140.12.0esr-1—

Weakness Classification(1)

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

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 48× in last 7d / 310× 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 663 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-12315?
CVE-2026-12315 is a critical vulnerability published on June 16, 2026. Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
When was CVE-2026-12315 disclosed?
CVE-2026-12315 was first published in the National Vulnerability Database on June 16, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12315 actively exploited?
CVE-2026-12315 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 83.8% of all scored CVEs.
What is the CVSS score of CVE-2026-12315?
CVE-2026-12315 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-12315?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12315, 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-2026-12315

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