Riskcovery

CVE-2025-67500

Mastodon Error Handling Discrepancy Enables Private Status Existence Enumeration

State
Published
Severity
3.7 Low
Published
Dec 9, 2025
Updated
Jan 8, 2026
Reserved
Dec 8, 2025

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.13.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:NGitHub_M

Weaknesses

  • CWE-204 Observable Response Discrepancy

Affected Products

ProductVersions
mastodonmastodon
  • < 4.2.28Affected
  • >= 4.3.0-beta.1, < 4.3.15Affected
  • >= 4.4.0-beta.1, < 4.4.10Affected
  • >= 4.5.0-beta.1, < 4.5.3Affected

References

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