Mastodon up to 4.2.26/4.3.13/4.4.5 API Endpoint dropped privileges

Summaryinfo

A vulnerability was found in Mastodon up to 4.2.26/4.3.13/4.4.5 and classified as critical. This impacts an unknown function of the component API Endpoint. Executing a manipulation can lead to dropped privileges. This vulnerability is registered as CVE-2025-62175. It is possible to launch the attack remotely. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Mastodon up to 4.2.26/4.3.13/4.4.5. This vulnerability affects an unknown code of the component API Endpoint. The manipulation with an unknown input leads to a dropped privileges vulnerability. The CWE definition for the vulnerability is CWE-273. The product attempts to drop privileges but does not check or incorrectly checks to see if the drop succeeded. As an impact it is known to affect confidentiality. CVE summarizes:

Mastodon is a free, open-source social network server based on ActivityPub. In versions before 4.4.6, 4.3.14, and 4.2.27, disabling or suspending a user account does not disconnect the account from the streaming API. This allows disabled or suspended accounts to continue receiving real-time updates through existing streaming connections and to establish new streaming connections, even though they cannot interact with other API endpoints. This undermines moderation actions, as administrators expect disabled or suspended accounts to be fully disconnected from the service. This issue has been patched in versions 4.4.6, 4.3.14, and 4.2.27. No known workarounds exist.

The advisory is available at github.com. This vulnerability was named CVE-2025-62175 since 10/07/2025. The exploitation appears to be easy. The attack can be initiated remotely. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 4.2.27, 4.3.14 or 4.4.6 eliminates this vulnerability. Applying the patch 2971ac9863b91372e68ac152caf6f4dbff511d17 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• Mastodon

Version

• 4.2.0
• 4.2.1
• 4.2.2
• 4.2.3
• 4.2.4
• 4.2.5
• 4.2.6
• 4.2.7
• 4.2.8
• 4.2.9
• 4.2.10
• 4.2.11
• 4.2.12
• 4.2.13
• 4.2.14
• 4.2.15
• 4.2.16
• 4.2.17
• 4.2.18
• 4.2.19
• 4.2.20
• 4.2.21
• 4.2.22
• 4.2.23
• 4.2.24
• 4.2.25
• 4.2.26
• 4.3.0
• 4.3.1
• 4.3.2
• 4.3.3
• 4.3.4
• 4.3.5
• 4.3.6
• 4.3.7
• 4.3.8
• 4.3.9
• 4.3.10
• 4.3.11
• 4.3.12
• 4.3.13
• 4.4.0
• 4.4.1
• 4.4.2
• 4.4.3
• 4.4.4
• 4.4.5

License

• open-source

Website

• Product: https://github.com/mastodon/mastodon/

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