CVE-2026-48028
Mastodon: Removal of integrity-protected JSON entries from signed activities
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.
INFO
Published Date :
June 24, 2026, 7:43 p.m.
Last Modified :
June 24, 2026, 7:43 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Affected Products
The following products are affected by CVE-2026-48028
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update Mastodon to version 4.5.10 or later.
- Update Mastodon to version 4.4.17 or later.
- Update Mastodon to version 4.3.23 or later.
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CVE-2026-48028 vulnerability anywhere in the article.