Security Advisory

CVE-2026-46349

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-24 19:40:35

Last updated 2026-06-25 13:16:49

Assigner GitHub_M

CVSS score 5.3

State PUBLISHED

Description

Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.5.10, 4.4.17, and 4.3.23, Mastodon's normalization of incoming activities signed with Linked-Data Signatures does not sufficiently protect the activities from a certain class of spoofing, allowing attackers to re-arrange a valid signed JSON-LD activity from a third-party actor to have it processed differently. This vulnerability is fixed in 4.5.10, 4.4.17, and 4.3.23.

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