CVE-2025-67500 - CVE House
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Status published Low CVE-2025-67500

Mastodon Error Handling Discrepancy Enables Private Status Existence Enumeration

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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Affected Vendor

Affected Software

mastodon
Vulnerable Versions:
< 4.2.28, >= 4.3.0-beta.1, < 4.3.15, >= 4.4.0-beta.1, < 4.4.10, >= 4.5.0-beta.1, < 4.5.3

Timeline

Official Publish: December 9th, 2025
Last Modified: January 8th, 2026
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Weaknesses (CWE)

CWE-204

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.