# CVE-2023-29532: Mozilla Firefox and 4 others: A local attacker can trick the Mozilla Maintenance Service into applying an unsigned update file by pointing…

CVE-2023-29532 is fixed in 3 products on 1 platform, first by Mozilla Firefox (en-US) 112.0, released April 12, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-29532
- Priority: Routine
- CVSS: 5.5
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 19, 2023
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-29532

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Mozilla Firefox (en-US) | 112.0 | [Mozilla Firefox (en-US) 112.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox-112.0.md) | Apr 12, 2023 |
| Windows apps | Mozilla Firefox ESR (en-US) | 115.4.0 | [Mozilla Firefox ESR (en-US) 115.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.esr-115.4.0.md) | Oct 17, 2023 |
| Windows apps | Mozilla Thunderbird (en-US) | 115.8.0 | [Mozilla Thunderbird (en-US) 115.8.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird-115.8.0.md) | Feb 21, 2024 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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