CVE-2024-5691

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-06-11 · updated 2026-06-17
Weakness: CWE-693

Description

By tricking the browser with a `X-Frame-Options` header, a sandboxed iframe could have presented a button that, if clicked by a user, would bypass restrictions to open a new window. This vulnerability affects Firefox < 127, Firefox ESR < 115.12, and Thunderbird < 115.12.

Affected products

Mozilla Firefox: before 127.0 — fixed in 127.0
Mozilla Firefox ESR: before 115.12 — fixed in 115.12
Mozilla Thunderbird: before 115.12 — fixed in 115.12

How to fix

Upgrade to a fixed version: Mozilla Firefox 127.0; Mozilla Firefox ESR 115.12; Mozilla Thunderbird 115.12. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1888695
https://lists.debian.org/debian-lts-announce/2024/06/msg00000.html
https://lists.debian.org/debian-lts-announce/2024/06/msg00010.html
https://www.mozilla.org/security/advisories/mfsa2024-25/
https://www.mozilla.org/security/advisories/mfsa2024-26/
https://www.mozilla.org/security/advisories/mfsa2024-28/
https://bugzilla.mozilla.org/show_bug.cgi?id=1888695
https://lists.debian.org/debian-lts-announce/2024/06/msg00000.html
https://lists.debian.org/debian-lts-announce/2024/06/msg00010.html
https://www.mozilla.org/security/advisories/mfsa2024-25/
https://www.mozilla.org/security/advisories/mfsa2024-26/
https://www.mozilla.org/security/advisories/mfsa2024-28/

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