CVE-2026-48028

Published: Jun 24, 2026Modified: Jun 25, 2026Deferred

6.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Exploitability: 3.9 / Impact: 2.5

Source: security-advisories@github.com (Secondary)

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 threat actors to remove JSON entries from valid signed activities from a third-party actor. This vulnerability is fixed in 4.5.10, 4.4.17, and 4.3.23.

Related CWEs

CWE-354

Improper Validation of Integrity Check Value

The product does not validate or incorrectly validates the integrity check values or "checksums" of a message. This may prevent it from detecting if the data has been modified or corrupted in transmission.

References (1)

https://github.com/mastodon/mastodon/security/advisories/GHSA-53m7-2wrh-q839

Source: security-advisories@github.com

Timeline

No history available yet.