Improper access control in Mastodon - CVE-2025-62605
Published: April 23, 2026
Vulnerability identifier: #VU126986
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-62605
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mastodon
Affected software:
Mastodon
Mastodon
Detailed vulnerability description
The vulnerability allows a remote user to bypass quote controls.
The vulnerability exists due to improper access control in quote post handling when quoting a reblogged post. A remote user can reblog a post and then quote their reblog to bypass quote controls.
The issue arises because reblogs are internally treated as statuses and were not special-treated for quote control enforcement.
How to mitigate CVE-2025-62605
Install security update from vendor's website.