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CVE-2026-48028

Mastodon: Removal of integrity-protected JSON entries from signed activities PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
mastodon / mastodonaffected >= 4.5.0-beta.1, < 4.5.10; affected >= 4.4.0-beta.1, < 4.4.17; affected < 4.3.23

CWE

CWE-354

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.