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.
References (4)
Core 4
Core References
Vendor Advisory x_refsource_confirm
https://github.com/mastodon/mastodon/security/advisories/GHSA-94h4-fj37-c825
Patch x_refsource_misc
https://github.com/mastodon/mastodon/commit/6b519cfefa93a923b19d0f20c292c7185f8fd5f5
Scores
CVSS v3
5.3
EPSS
0.0045
EPSS Percentile
63.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-285
CWE-200
Status
published
Products (1)
joinmastodon/mastodon
< 4.1.23
Published
Feb 27, 2025
Tracked Since
Feb 18, 2026