What’s Vulnerable › Vulnerabilities

CVE-2022-29909

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-12-22 · updated 2026-06-17
• Weakness: CWE-276

Description

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.

Affected products

• Mozilla Firefox: before 100.0 — fixed in 100.0
• Mozilla Firefox ESR: before 91.9 — fixed in 91.9
• Mozilla Thunderbird: before 91.9 — fixed in 91.9

How to fix

Upgrade to a fixed version: Mozilla Firefox 100.0; Mozilla Firefox ESR 91.9; Mozilla Thunderbird 91.9. Check the vendor advisory for mitigations.

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
• 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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