CVE-2026-12295

CRITICALPre-NVD 9.69.6—
EchelonGraph scoreMEDIUM confidence

Score 9.6 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-16. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
9.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 9.6Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

CVSS v3
9.6
EG Score
9.6CRITICALmedium confidence
EG Risk
43
EG Risk 43/100

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
Severity96% × 45%
Exploitation0% × 40%
Automatability0% × 15%
EPSS PROB
0.4%
EPSS %ILE
31st
KEV
Not listed

Published

June 16, 2026

Last Modified

July 15, 2026

Advisory Details (10)

Auto-updated Oct 7, 2026
Patch available. Sources: redhat.
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:29940
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:27734
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:27733
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:27717
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 115.37 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-59/
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

2040160 - (CVE-2026-12295) Content process can forge DocumentChannel srcdoc load state to execute SystemPrincipal script in parent process

https://bugzilla.mozilla.org/show_bug.cgi?id=2040160

Vendor Advisories for CVE-2026-12295(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 / EcosystemFix (by version range) / PatchReleasedSource
redhatthunderbird-0:140.12.0-1.el9_22026-07-15redhat
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.el8_82026-07-14redhat
redhatthunderbird-0:140.12.0-1.el9_62026-07-13redhat
redhatthunderbird-0:140.12.0-1.el10_02026-07-13redhat
redhatfirefox-0:140.12.0-1.el9_42026-07-13redhat
redhatthunderbird-0:140.12.0-1.el9_42026-07-13redhat
redhatfirefox-0:140.12.0-1.el7_92026-07-13redhat
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.el9_22026-07-07redhat
redhatfirefox-0:140.12.0-1.el8_82026-07-07redhat
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.el9_82026-06-22redhat
redhatfirefox-0:140.12.0-1.el10_22026-06-22redhat
redhatfirefox-0:140.12.0-1.el8_102026-06-22redhat

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 rangeFix by version rangeDependents
firefox-esr102.1.0esr-1 ... 91.9.1esr-1~deb9u1 (279 versions)
  • every version up to 140.12.0esr-1~deb11u1: fixed in 140.12.0esr-1~deb11u1
—
thunderbird1:102.0.1-1 ... 1:91.9.0-1~deb9u1 (330 versions)
  • every version up to 1:140.12.0esr-1~deb11u1: fixed in 1:140.12.0esr-1~deb11u1
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr102.11.0esr-1 ... 140.9.1esr-1~deb13u1 (186 versions)
  • every version up to 140.12.0esr-1~deb12u1: fixed in 140.12.0esr-1~deb12u1
—
thunderbird1:102.11.0-1 ... 1:140.9.1esr-1~deb13u1 (215 versions)
  • every version up to 1:140.12.0esr-1~deb12u1: fixed in 1:140.12.0esr-1~deb12u1
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (62 versions)
  • every version up to 140.12.0esr-1~deb13u1: fixed in 140.12.0esr-1~deb13u1
—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (71 versions)
  • every version up to 1:140.12.0esr-1~deb13u1: fixed in 1:140.12.0esr-1~deb13u1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (63 versions)
  • every version up to 140.12.0esr-1: fixed in 140.12.0esr-1
—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (72 versions)
  • every version up to 1:140.12.0esr-1: fixed in 1:140.12.0esr-1
—

Weakness Classification(2)

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 7× in last 7d / 24× 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 687 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-12295?
CVE-2026-12295 is a critical vulnerability published on June 16, 2026. Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
When was CVE-2026-12295 disclosed?
CVE-2026-12295 was first published on June 16, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12295 actively exploited?
CVE-2026-12295 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (31st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-12295?
CVE-2026-12295 has a CVSS v3.1 base score of 9.6 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-12295?
A fix for CVE-2026-12295 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-12295 are linked in the Vendor Advisories panel on this page.

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