CVE-2026-48028
Medium · 6.5CVSS
6.5
EPSS
0.2%
Published
Jun 24, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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