CVE-2022-22761

8.8 highEPSS 0.8%

High (8.8) in mozilla. EPSS 0.8% chance of exploitation in the next 30 days.

Web-accessible extension pages (pages with a moz-extension:// scheme) were not correctly enforcing the frame-ancestors directive when it was used in the Web Extension's Content Security Policy. This vulnerability affects Firefox < 97, Thunderbird < 91.6, and Firefox ESR < 91.6.

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: 0.8% chance of exploitation in the next 30 days; higher than 56% of CVEs (scores of 2026-10-31)
CWE: CWE-693
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=1745566
https://www.mozilla.org/security/advisories/mfsa2022-04/
https://www.mozilla.org/security/advisories/mfsa2022-05/
https://www.mozilla.org/security/advisories/mfsa2022-06/
https://bugzilla.mozilla.org/show_bug.cgi?id=1745566

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