Observable discrepancy in Mastodon - CVE-2025-67500
Published: April 23, 2026
Vulnerability identifier: #VU126987
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-67500
CWE-ID: CWE-203
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to inconsistent error handling in status lookup handling when processing requests with a non-English Accept-Language header. A remote attacker can send a request for a known status identifier to disclose sensitive information.
The issue only allows confirmation of whether a private status exists and cannot be used to learn its contents or other properties.
Affected software
Mastodon
How to mitigate CVE-2025-67500
Install security update from vendor's website.
Mastodon - addressed in versions 4.2.28, 4.3.15, 4.4.10, 4.5.3