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CVE-2025-67500

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CVE-2025-67500

Published: Dec 9, 2025

Modified: Jan 8, 2026

PUBLISHED

CVSS v3.1

3.7

LOW

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.

VendorProductVersions

mastodon

mastodon

affected
< 4.2.28
affected
>= 4.3.0-beta.1, < 4.3.15
affected
>= 4.4.0-beta.1, < 4.4.10
affected
>= 4.5.0-beta.1, < 4.5.3

Weaknesses (CWE)

CWE-204

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

References

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