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CVE-2026-23961

MEDIUM
5.3

Description

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.

Details CVE

Score CVSS v3.15.3
SeveriteMEDIUM
Vecteur CVSSCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Vecteur d'attaqueNETWORK
ComplexiteLOW
Privileges requisNONE
Interaction utilisateurNONE
Publie1/22/2026
Derniere modification2/2/2026
Sourcenvd
Observations honeypot0

Produits affectes

joinmastodon:mastodon

Faiblesses (CWE)

CWE-863

References

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)

Correlations IOC

Aucune correlation enregistree

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