What’s Vulnerable › Vulnerabilities

CVE-2022-22759

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% 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-693

Description

If a document created a sandboxed iframe without <code>allow-scripts</code>, and subsequently appended an element to the iframe's document that e.g. had a JavaScript event handler - the event handler would have run despite the iframe's sandbox. This vulnerability affects Firefox < 97, Thunderbird < 91.6, and Firefox ESR < 91.6.

Affected products

• Mozilla Firefox: before 97.0 — fixed in 97.0
• Mozilla Firefox ESR: before 91.6 — fixed in 91.6
• Mozilla Thunderbird: before 91.6 — fixed in 91.6

How to fix

Upgrade to a fixed version: Mozilla Firefox 97.0; Mozilla Firefox ESR 91.6; Mozilla Thunderbird 91.6. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1739957
• 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=1739957
• 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=1739957

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