CVE Explorer
CVE-2026-46349
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 attackers to re-arrange a valid signed JSON-LD activity from a third-party actor to have it processed differently. This vulnerability is fixed in 4.5.10, 4.4.17, and 4.3.23.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"mastodon","vendor":"mastodon","versions":[{"status":"affected","version":">= 4.5.0-beta.1, < 4.5.10"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:34dfa8652e4786b750f8d4db20d41165c999ab1c4746968cd13827b272fb634f · sha256:9b7c271ab73a4eb1… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:34dfa8652e4786b750f8d4db20d41165c999ab1c4746968cd13827b272fb634f · sha256:9b7c271ab73a4eb1… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-347","description":"CWE-347: Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:34dfa8652e4786b750f8d4db20d41165c999ab1c4746968cd13827b272fb634f · sha256:9b7c271ab73a4eb1… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"name":"https://github.com/mastodon/mastodon/security/advisories/GHSA-chgx-jx3p-rf73","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mastodon/mastodon/security/advisories/GHSA-chgx-jx3p-rf73"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:34dfa8652e4786b750f8d4db20d41165c999ab1c4746968cd13827b272fb634f · sha256:9b7c271ab73a4eb1… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.