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CVE-2025-67500
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Date: December 9, 2025
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.
Severity Score
Related Resources (4)
Severity Score
Weakness Type (CWE)
Observable Response Discrepancy
CWE-204Top Fix
Upgrade Version
Upgrade to version https://github.com/mastodon/mastodon.git - v4.2.28;https://github.com/mastodon/mastodon.git - v4.3.15;https://github.com/mastodon/mastodon.git - v4.4.10;https://github.com/mastodon/mastodon.git - v4.5.3
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | HIGH |
| User Interaction (UI): | NONE |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | LOW |
| Integrity (I): | NONE |
| Availability (A): | NONE |