Vulnerability Description
Mastodon is a free, open-source social network server based on ActivityPub. Versions 4.2.27 and prior, 4.3.0-beta.1 through 4.3.14, 4.4.0-beta.1 through 4.4.9, 4.5.0-beta.1 through 4.5.2 have discrepancies in error handling which allow checking whether a given status exists by sending a request with a non-English Accept-Language header. Using this behavior, an attacker who knows the identifier of a particular status they are not allowed to see can confirm whether this status exists or not. This cannot be used to learn the contents of the status or any other property besides its existence. This issue is fixed in versions 4.2.28, 4.3.15, 4.4.10 and 4.5.3.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Joinmastodon | Mastodon | < 4.2.28 |
Related Weaknesses (CWE)
References
- https://github.com/mastodon/mastodon/pull/37077/commits/9957d3218cb33fea6a44bb28Patch
- https://github.com/mastodon/mastodon/security/advisories/GHSA-gwhw-gcjx-72v8Vendor Advisory
FAQ
What is CVE-2025-67500?
CVE-2025-67500 is a vulnerability with a CVSS score of 3.7 (LOW). Mastodon is a free, open-source social network server based on ActivityPub. Versions 4.2.27 and prior, 4.3.0-beta.1 through 4.3.14, 4.4.0-beta.1 through 4.4.9, 4.5.0-beta.1 through 4.5.2 have discrepa...
How severe is CVE-2025-67500?
CVE-2025-67500 has been rated LOW with a CVSS base score of 3.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-67500?
Check the references section above for vendor advisories and patch information. Affected products include: Joinmastodon Mastodon.