CVE-2022-29909

8.8 highEPSS 0.9%

High (8.8) in mozilla. EPSS 0.9% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

8.8 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS: 0.9% chance of exploitation in the next 30 days; higher than 59% of CVEs (scores of 2026-10-31)
CWE: CWE-276
Published: 2022-12-22
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mozilla:firefox
mozilla:firefox_esr
mozilla:thunderbird

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1755081
https://www.mozilla.org/security/advisories/mfsa2022-16/
https://www.mozilla.org/security/advisories/mfsa2022-17/
https://www.mozilla.org/security/advisories/mfsa2022-18/
https://bugzilla.mozilla.org/show_bug.cgi?id=1755081

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