SB2026042383 - Improper access control in Mastodon
Published: April 23, 2026
Security Bulletin ID
SB2026042383
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper access control (CVE-ID: CVE-2025-62605)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 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
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.
Remediation
Install update from vendor's website.