CVE-2022-29916

MEDIUM 6.5EPSS 0.7%

Firefox behaved slightly differently for already known resources when loading CSS resources involving CSS variables. This could have been used to probe the browser history. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.

CVSS v3.1: 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CVSS v3.1: 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
EPSS: 0.72% chance of exploitation in the next 30 days, 52th percentile
Published: 2022-12-22
Updated: 2025-04-15

Proof-of-concept exploits (1)

https://bugzilla.mozilla.org/show_bug.cgi?id=1760674

References

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