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CVE-2026-23961

MEDIUM
5.3

Beschreibung

Mastodon is a free, open-source social network server based on ActivityPub. Mastodon allows server administrators to suspend remote users to prevent interactions. However, some logic errors allow already-known posts from such suspended users to appear in timelines if boosted. Furthermore, under certain circumstances, previously-unknown posts from suspended users can be processed. This issue allows old posts from suspended users to occasionally end up on timelines on all Mastodon versions. Additionally, on Mastodon versions from v4.5.0 to v4.5.4, v4.4.5 to v4.4.11, v4.3.13 to v4.3.17, and v4.2.26 to v4.2.29, remote suspended users can partially bypass the suspension to get new posts in. Mastodon versions v4.5.5, v4.4.12, v4.3.18 are patched.

CVE Details

CVSS v3.1 Bewertung5.3
SchweregradMEDIUM
CVSS VektorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
AngriffsvektorNETWORK
KomplexitatLOW
Erforderliche PrivilegienNONE
BenutzerinteraktionNONE
Veroffentlicht1/22/2026
Zuletzt geandert2/2/2026
Quellenvd
Honeypot-Sichtungen0

Betroffene Produkte

joinmastodon:mastodon

Schwachen (CWE)

CWE-863

Referenzen

https://github.com/mastodon/mastodon/releases/tag/v4.3.18(security-advisories@github.com)
https://github.com/mastodon/mastodon/releases/tag/v4.4.12(security-advisories@github.com)
https://github.com/mastodon/mastodon/releases/tag/v4.5.5(security-advisories@github.com)
https://github.com/mastodon/mastodon/security/advisories/GHSA-5h2f-wg8j-xqwp(security-advisories@github.com)

IOC Korrelationen

Keine Korrelationen erfasst

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