{"id":"CVE-2026-46713","state":"PUBLISHED","title":"Misskey: JSON-LD signature validation + compaction may lead to improper activity handling","description":"Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4, contain a vulnerability in the JSON-LD signature validation and compaction process that allows spoofed activities to be accepted as valid. This issue has been fixed in version 2026.5.4.","publishedAt":"2026-08-03T21:37:45.657Z","updatedAt":"2026-08-04T15:44:53.013Z","severity":{"score":9.2,"label":"Critical","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:H/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["misskey-dev misskey"],"affected":[{"vendor":"misskey-dev","product":"misskey","versions":[{"version":">= 12.37.0, < 2026.5.4","status":"affected"}]}],"references":["https://github.com/misskey-dev/misskey/security/advisories/GHSA-w8x2-gpq6-jxvf","https://github.com/misskey-dev/misskey/releases/tag/2026.5.4"],"weaknesses":["CWE-347"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46713.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46713","state":"PUBLISHED","datePublished":"2026-08-03T21:37:45.657Z","dateUpdated":"2026-08-04T15:44:53.013Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-15T23:26:58.309Z"},"containers":{"cna":{"title":"Misskey: JSON-LD signature validation + compaction may lead to improper activity handling","descriptions":[{"lang":"en","value":"Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4, contain a vulnerability in the JSON-LD signature validation and compaction process that allows spoofed activities to be accepted as valid. This issue has been fixed in version 2026.5.4."}],"affected":[{"vendor":"misskey-dev","product":"misskey","versions":[{"version":">= 12.37.0, < 2026.5.4","status":"affected"}]}],"references":[{"url":"https://github.com/misskey-dev/misskey/security/advisories/GHSA-w8x2-gpq6-jxvf","name":"https://github.com/misskey-dev/misskey/security/advisories/GHSA-w8x2-gpq6-jxvf","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/misskey-dev/misskey/releases/tag/2026.5.4","name":"https://github.com/misskey-dev/misskey/releases/tag/2026.5.4","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"HIGH","subAvailabilityImpact":"NONE","baseScore":9.2,"baseSeverity":"CRITICAL","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:H/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-347","lang":"en","description":"CWE-347: Improper Verification of Cryptographic Signature","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-03T21:44:56.164Z"},"source":{"advisory":"GHSA-w8x2-gpq6-jxvf","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-04T15:44:21.423574Z","id":"CVE-2026-46713","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-04T15:44:53.013Z"}}]}}}