CVE-2024-6612: CSP violation leakage when using devtools

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-07-09 · updated 2026-06-17
Weakness: CWE-200

Description

CSP violations generated links in the console tab of the developer tools, pointing to the violating resource. This caused a DNS prefetch which leaked that a CSP violation happened. This vulnerability affects Firefox < 128 and Thunderbird < 128.

Affected products

Mozilla Firefox: before 128.0 — fixed in 128.0
Mozilla Thunderbird: before 128.0 — fixed in 128.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 128.0; Mozilla Thunderbird 128.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1880374
https://www.mozilla.org/security/advisories/mfsa2024-29/
https://www.mozilla.org/security/advisories/mfsa2024-32/
https://bugzilla.mozilla.org/show_bug.cgi?id=1880374
https://www.mozilla.org/security/advisories/mfsa2024-29/
https://www.mozilla.org/security/advisories/mfsa2024-32/

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