CVE-2025-27399
Medium
Description
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.
SeverityMedium
CVSS5.3
Exploit probability—
Product
Mastodon
PublishedFeb 27, 2025
First seenFeb 27, 2025
Weakness typeCWE-200Sensitive information exposureCWE-285CWE-285
How to fix
Update
- joinmastodon mastodon4.1.23, 4.2.16, 4.3.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| joinmastodon mastodon | v < 4.1.23, 4.2.0 ≤ v < 4.2.16, 4.3.0 ≤ v < 4.3.4 | 4.1.23, 4.2.16, 4.3.4 |
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