Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2025-27399

Mastodon is a self-hosted, federated microblogging platform. In versions prior to 4.1.23, 4.2.16, and 4.3.4, when the visibility for domain blocks/reasons is set to "users" (localized English string: "To logged-in users"), users that are not yet approved can view the block reasons. Instance admins that do not want their domain blocks to be public are impacted. Versions 4.1.23, 4.2.16, and 4.3.4 fix the issue.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 23.0%
CVSS Severity
CVSS v3 Score 5.3
Products affected by CVE-2025-27399


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