CVE-2022-26387

When installing an add-on, Firefox verified the signature before prompting the user; but while the user was confirming the prompt, the underlying add-on file could have been modified and Firefox would not have noticed. This vulnerability affects Firefox < 98, Firefox ESR < 91.7, and Thunderbird < 91.7.

Affected

Mozilla · Firefox · Firefox ESR · Thunderbird

CVSS v3.1 NVD

7.5 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

0.65% chance of exploitation in the next 30 days, 50th percentile

Published

2022-12-22

Updated

2025-04-15

Proof-of-concept exploits (1)

• https://bugzilla.mozilla.org/show_bug.cgi?id=1752979

Security advisories

• https://www.mozilla.org/security/advisories/mfsa2022-10
• https://www.mozilla.org/security/advisories/mfsa2022-11
• https://www.mozilla.org/security/advisories/mfsa2022-12

References

• CVE Record
• NVD entry