CVE-2022-31736

9.8 criticalEPSS 1.1%

Critical (9.8) in mozilla. EPSS 1.1% chance of exploitation in the next 30 days.

A malicious website could have learned the size of a cross-origin resource that supported Range requests. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 1.1% chance of exploitation in the next 30 days; higher than 65% of CVEs (scores of 2026-10-31)
CWE: CWE-942
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=1735923
https://www.mozilla.org/security/advisories/mfsa2022-20/
https://www.mozilla.org/security/advisories/mfsa2022-21/
https://www.mozilla.org/security/advisories/mfsa2022-22/
https://bugzilla.mozilla.org/show_bug.cgi?id=1735923

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