CVE-2022-29909

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-12-22. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: Elevated riskExposed: 0

A fix is available — apply it.

Documents in deeply-nested cross-origin browsing contexts could have obtained permissions granted to the top-level origin, bypassing the existing prompt and wrongfully inheriting the top-level permissions. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
56(Track*)
EG Risk 56/100SSVC: 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
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
56%
KEV
Not listed

Published

December 22, 2022

Last Modified

April 16, 2025

Advisory Details (4)

Auto-updated Aug 27, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

1755081 - (CVE-2022-29909) Cross-origin embeds/objects can obtain permissions of the top-level origin

https://bugzilla.mozilla.org/show_bug.cgi?id=1755081
generic

Security Vulnerabilities fixed in Thunderbird 91.9 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2022-18/
generic

Security Vulnerabilities fixed in Firefox ESR 91.9 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2022-17/
generic

Security Vulnerabilities fixed in Firefox 100 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2022-16/

Vendor Advisories for CVE-2022-29909(2)

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

Patch Availability(14)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox-locale-ast (100.0+build2-0ubuntu0.20.04.1) @ focal2026-05-25ubuntu
ubuntuthunderbird-locale-mk (1:91.9.1+build1-0ubuntu0.22.04.1) @ jammy2026-05-25ubuntu
redhatfirefox-0:91.9.0-1.el9_02022-05-18redhat
redhatthunderbird-0:91.9.0-3.el9_02022-05-18redhat
redhatthunderbird-0:91.9.0-3.el8_52022-05-05redhat
redhatthunderbird-0:91.9.0-3.el7_92022-05-05redhat
redhatthunderbird-0:91.9.0-3.el8_12022-05-05redhat
redhatthunderbird-0:91.9.0-3.el8_42022-05-05redhat
redhatthunderbird-0:91.9.0-3.el8_22022-05-05redhat
redhatfirefox-0:91.9.0-1.el8_22022-05-04redhat
redhatfirefox-0:91.9.0-1.el7_92022-05-04redhat
redhatfirefox-0:91.9.0-1.el8_52022-05-04redhat
redhatfirefox-0:91.9.0-1.el8_12022-05-04redhat
redhatfirefox-0:91.9.0-1.el8_42022-05-04redhat

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

(12 across 6 ecosystems)
Debian:10(2)
PackageVulnerable rangeFixed inDependents
firefox-esr60.7.2esr-1 ... 91.9.0esr-1~deb9u1 (146 versions)91.9.0esr-1~deb10u1—
thunderbird1:60.7.2-1 ... 1:91.9.0-1~deb9u1 (184 versions)1:91.9.0-1~deb10u1—
Debian:11(2)
PackageVulnerable rangeFixed inDependents
firefox-esr78.12.0esr-1 ... 91.9.0esr-1~deb9u1 (44 versions)91.9.0esr-1~deb11u1—
thunderbird1:78.12.0-1 ... 1:91.9.0-1~deb9u1 (61 versions)1:91.9.0-1~deb11u1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—91.9.0esr-1—
thunderbird—1:91.9.0-1—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—91.9.0esr-1—
thunderbird—1:91.9.0-1—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—91.9.0esr-1—
thunderbird—1:91.9.0-1—
Debian:9(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.9.0esr-1 ... 91.8.0esr-1~deb9u1 (253 versions)91.9.0esr-1~deb9u1—
thunderbird1.5-4 ... 1:91.8.1-1 (265 versions)1:91.9.0-1~deb9u1—

Weakness Classification(1)

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

Additional Vendor Advisories

(12)

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 9× in last 7d / 30× 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 159 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2022-29909?
CVE-2022-29909 is a high vulnerability published on December 22, 2022. Documents in deeply-nested cross-origin browsing contexts could have obtained permissions granted to the top-level origin, bypassing the existing prompt and wrongfully inheriting the top-level permissions. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.
When was CVE-2022-29909 disclosed?
CVE-2022-29909 was first published in the National Vulnerability Database on December 22, 2022, with the most recent update on April 16, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-29909 actively exploited?
CVE-2022-29909 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 44.0% of all scored CVEs.
What is the CVSS score of CVE-2022-29909?
CVE-2022-29909 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2022-29909?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-29909, 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-2022-29909

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