{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-46349", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-05-13T18:37:30.990Z", "datePublished": "2026-06-24T19:40:35.022Z", "dateUpdated": "2026-06-25T13:16:49.851Z"}, "containers": {"cna": {"title": "Mastodon: LD-Signature Bypass via JSON-LD Named-Graph Restructuring", "problemTypes": [{"descriptions": [{"cweId": "CWE-347", "lang": "en", "description": "CWE-347: Improper Verification of Cryptographic Signature", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"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"}}], "references": [{"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"}], "affected": [{"vendor": "mastodon", "product": "mastodon", "versions": [{"version": ">= 4.5.0-beta.1, < 4.5.10", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-06-24T19:40:35.022Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-chgx-jx3p-rf73", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-25T13:16:40.328930Z", "id": "CVE-2026-46349", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-25T13:16:49.851Z"}}]}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.5.0-beta.1,4.5.10)"}}], "enrichment": {"confidence": 89.0, "confidence_source": "matching", "scores": [{"score": 89.0, "source": "matching"}]}, "original": {"product": "mastodon", "source": "cna", "vendor": "mastodon"}, "product": "mastodon", "vendor": "joinmastodon"}], "created": "2026-06-24T21:45:15.820238+00:00", "updated": "2026-06-25T13:15:03.628608+00:00", "vendors": ["joinmastodon", "joinmastodon$PRODUCT$mastodon"]}