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CVE-2025-62605

4.3 · MEDIUM

Mastodon is a free, open-source social network server based on ActivityPub.

Published Oct 21, 2025CWE-754EPSS 0.29%

Overview

CVE-2025-62605 is a medium-severity vulnerability. It was published on October 21, 2025 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Mastodon is a free, open-source social network server based on ActivityPub. In Mastodon version 4.4, support for verifiable quote posts with quote controls was added, but it is possible for an attacker to bypass these controls in Mastodon versions prior to 4.4.8 and 4.5.0-beta.2. Mastodon internally treats reblogs as statuses. Since they were not special-treated, an attacker could reblog any post, then quote their reblog, technically quoting themselves, but having the quote feature a preview of the post they did not get authorization for with all of the affordances that would be otherwise denied by the quote controls. This issue has been patched in versions 4.4.8 and 4.5.0-beta.2.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/mastodon/mastodon/commit/2dc4552229b55e2e4adaef675e68ed7ae123d78eGitHubgithub.com/mastodon/mastodon/commit/405a49df44033e7d179f3d44d59fb68a67d54789GitHubgithub.com/mastodon/mastodon/releases/tag/v4.4.8GitHubgithub.com/mastodon/mastodon/releases/tag/v4.5.0-beta.2GitHubgithub.com/mastodon/mastodon/security/advisories/GHSA-8h43-rcqj-wpc6

How CyberStrike helps

Frequently asked questions

What is CVE-2025-62605?

CVE-2025-62605 is a medium-severity vulnerability. It was published on October 21, 2025 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2025-62605?

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-62605?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-62605?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-62605 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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