CVE-2022-29916

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.

Affected

Mozilla · Thunderbird · Firefox ESR · Firefox

CVSS v3.1 NVD

6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS

0.73% chance of exploitation in the next 30 days, 53rd percentile

Published

2022-12-22

Updated

2025-04-15

Proof-of-concept exploits (1)

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

Security advisories

• https://www.mozilla.org/security/advisories/mfsa2022-16
• https://www.mozilla.org/security/advisories/mfsa2022-17
• https://www.mozilla.org/security/advisories/mfsa2022-18

References

• CVE Record
• NVD entry