What’s Vulnerable › Vulnerabilities

CVE-2022-31738

• 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-290

Description

When exiting fullscreen mode, an iframe could have confused the browser about the current state of fullscreen, resulting in potential user confusion or spoofing attacks. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.

Affected products

• Mozilla Firefox: before 101 — fixed in 101
• Mozilla Firefox ESR: before 91.10 — fixed in 91.10
• Mozilla Thunderbird: before 91.10 — fixed in 91.10

How to fix

Upgrade to a fixed version: Mozilla Firefox 101; Mozilla Firefox ESR 91.10; Mozilla Thunderbird 91.10. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1756388
• 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=1756388
• 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=1756388

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