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CVE-2025-67500

Mastodon Error Handling Discrepancy Enables Private Status Existence Enumeration

Published: Dec 9, 2025Updated: Dec 19, 2025 Sources: CVE List NVDCWE-204
NVD MITRE
3.7CVSSLOW
EPSS Score
0.2%
Top 91.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-204

Affected Products

mastodonmastodon
On-prem
Communications / messaging-chat
mastodonjoinmastodon
On-prem
Communications / messaging-chat
mastodonoss-projectCommunicationsaka mastodon/mastodon
joinmastodonoss-projectCommunicationsaka mastodon

Exploitability

Official Patch Available

References

https://github.com/mastodon/mastodon/security/advisories/GHSA-gwhw-gcjx-72v8
github.com
https://github.com/mastodon/mastodon/pull/37077/commits/9957d3218cb33fea6a44bb285e2ba4795a059e4f
github.com

Timeline

Published
Dec 9, 2025
Last Updated
Dec 19, 2025

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