CVE-2023-29532

A local attacker can trick the Mozilla Maintenance Service into applying an unsigned update file by pointing the service at an update file on a malicious SMB server. The update file can be replaced after the signature check, before the use, because the write-lock requested by the service does not work on a SMB server. *Note: This attack requires local system access and only affects Windows. Other operating systems are not affected.* This vulnerability affects Firefox < 112, Firefox ESR < 102.10, and Thunderbird < 102.10.

CVSS 3.1

5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS

0.2% chance of exploitation in the next 30 days; higher than 8% of CVEs (scores of 2026-10-25)

Published

2023-06-19

Modified

2026-10-23

Record from

the NVD, synced 2026-10-24

Affected

• mozilla:firefox
• mozilla:firefox_esr
• mozilla:thunderbird

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1806394
• https://www.mozilla.org/security/advisories/mfsa2023-13/
• https://www.mozilla.org/security/advisories/mfsa2023-14/
• https://www.mozilla.org/security/advisories/mfsa2023-15/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1806394

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