What’s Vulnerable › Vulnerabilities

CVE-2022-31744

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% 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-79

Description

An attacker could have injected CSS into stylesheets accessible via internal URIs, such as resource:, and in doing so bypass a page's Content Security Policy. This vulnerability affects Firefox ESR < 91.11, Thunderbird < 102, Thunderbird < 91.11, and Firefox < 101.

Affected products

• Mozilla Firefox: before 101.0 — fixed in 101.0
• Mozilla Firefox ESR: before 91.11 — fixed in 91.11
• Mozilla Thunderbird: before 91.11 — fixed in 91.11

How to fix

Upgrade to a fixed version: Mozilla Firefox 101.0; Mozilla Firefox ESR 91.11; Mozilla Thunderbird 91.11. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1757604
• https://www.mozilla.org/security/advisories/mfsa2022-20/
• https://www.mozilla.org/security/advisories/mfsa2022-25/
• https://www.mozilla.org/security/advisories/mfsa2022-26/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1757604
• https://www.mozilla.org/security/advisories/mfsa2022-20/
• https://www.mozilla.org/security/advisories/mfsa2022-25/
• https://www.mozilla.org/security/advisories/mfsa2022-26/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1757604

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