PT-2026-3898 · Mastodon · Mastodon

Welshpixie

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Published

2026-01-22

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Updated

2026-02-03

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CVE-2026-23961

CVSS v3.1

5.3

Medium

VectorAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Name of the Vulnerable Software and Affected Versions Mastodon versions 4.2.26 through 4.2.29 Mastodon versions 4.3.13 through 4.3.17 Mastodon versions 4.4.5 through 4.4.11 Mastodon versions 4.5.0 through 4.5.4
Description Mastodon is a social network server that allows administrators to suspend users. Logic errors exist that can allow posts from suspended users to appear in timelines, even after suspension. Specifically, known posts from suspended users can appear if they have been boosted. In some cases, previously unknown posts from suspended users can also be processed. In certain versions, suspended users can partially bypass the suspension to post new content.
Recommendations Update to Mastodon version 4.5.5. Update to Mastodon version 4.4.12. Update to Mastodon version 4.3.18.

Exploit

Fix

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

BIT-MASTODON-2026-23961
CVE-2026-23961
GHSA-5H2F-WG8J-XQWP

Affected Products

Mastodon