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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| mastodon | mastodon | >= 4.5.0-beta.1, < 4.5.10, >= 4.4.0-beta.1, < 4.4.17, < 4.3.23 | — |