CVE-2026-48028
6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| mastodon | mastodon | >= 4.5.0-beta.1, < 4.5.10 | affected |
| mastodon | mastodon | >= 4.4.0-beta.1, < 4.4.17 | affected |
| mastodon | mastodon | < 4.3.23 | affected |
Weaknesses
- CWE-354: CWE-354: Improper Validation of Integrity Check Value
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: partial
References
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