# CVE-2025-62605: Mastodon is a free, open-source social network server based on ActivityPub. In Mastodon version 4.4, support for…

Source: https://junglewise.ai/threats/cve-2025-62605-mastodon-is-a-free-open-source-social-network-server-based-on  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-10-21  
License: CC BY 4.0 with a link back

CVE-2025-62605 · Severity: medium · CVSS 4.3 · Published 2025-10-21

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.

Technologies: [Joinmastodon Mastodon](https://junglewise.ai/threats/technologies/joinmastodon-mastodon). Vendors: [Joinmastodon](https://junglewise.ai/threats/vendors/joinmastodon).

## Quick answers

**Is CVE-2025-62605 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-62605 being exploited in the wild.

**How severe is CVE-2025-62605?** Medium severity, with a CVSS score of 4.3, published 21 October 2025.

**Which products and versions are affected?** Joinmastodon Mastodon. The advisory does not name versions.

**Is there a fix for CVE-2025-62605?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2025-62605?** Check whether you run Joinmastodon Mastodon. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Joinmastodon Mastodon

## Related threats

- [Mastodon is a free, open-source social network server based on ActivityPub. Prior to v4.5.9, v4.4.16, and v4.3.22…](https://junglewise.ai/threats/cve-2026-41259-mastodon-is-a-free-open-source-social-network-server-based-on)
- [Mastodon is a free, open-source social network server based on ActivityPub. Versions 4.2.27 and prior, 4.3.0-beta.1…](https://junglewise.ai/threats/cve-2025-67500-mastodon-is-a-free-open-source-social-network-server-based-on)