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VULNERABILITIES

CVE-2026-33869 Details

Description

Mastodon is a free, open-source social network server based on ActivityPub. In versions on the 4.5.x branch prior to 4.5.8 and on the 4.4.x branch prior to 4.4.15, an attacker that knows of a quote before it has reached a server can prevent it from being correctly processed on that server. The vulnerability has been patched in Mastodon 4.5.8 and 4.4.15. Mastodon 4.3 and earlier are not affected because they do not support quotes.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:4.8 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/mastodon/mastodon/security/advisories/GHSA-q4g8-82c5-9h33 [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-863Incorrect Authorization[email protected]

Affected Products

ProductVersions
joinmastodon mastodon
>= 4.4.0, < 4.4.15
>= 4.5.0, < 4.5.8

CPE

  • cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-33869
NVD Published Date:
Mar 27, 2026
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2026-33869 Details - Not Deferred