{"id":"CVE-2026-28432","state":"PUBLISHED","title":"HTTP signature verification can be bypassed","description":"Misskey is an open source, federated social media platform. All Misskey servers prior to 2026.3.1 contain a vulnerability that allows bypassing HTTP signature verification. Although this is a vulnerability related to federation, it affects all servers regardless of whether federation is enabled or disabled. This vulnerability is fixed in 2026.3.1.","publishedAt":"2026-03-09T21:19:43.220Z","updatedAt":"2026-03-10T14:45:12.846Z","severity":{"score":7.1,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["misskey-dev misskey"],"affected":[{"vendor":"misskey-dev","product":"misskey","versions":[{"version":"< 2026.3.1","status":"affected"}]}],"references":["https://github.com/misskey-dev/misskey/security/advisories/GHSA-grwc-c762-gcvp"],"weaknesses":["CWE-347"],"ingestedAt":"2026-10-29T20:11:31.369Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/28xxx/CVE-2026-28432.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-28432","state":"PUBLISHED","datePublished":"2026-03-09T21:19:43.220Z","dateUpdated":"2026-03-10T14:45:12.846Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-02-27T15:54:05.137Z"},"containers":{"cna":{"title":"HTTP signature verification can be bypassed","descriptions":[{"lang":"en","value":"Misskey is an open source, federated social media platform. All Misskey servers prior to 2026.3.1 contain a vulnerability that allows bypassing HTTP signature verification. Although this is a vulnerability related to federation, it affects all servers regardless of whether federation is enabled or disabled. This vulnerability is fixed in 2026.3.1."}],"affected":[{"vendor":"misskey-dev","product":"misskey","versions":[{"version":"< 2026.3.1","status":"affected"}]}],"references":[{"url":"https://github.com/misskey-dev/misskey/security/advisories/GHSA-grwc-c762-gcvp","name":"https://github.com/misskey-dev/misskey/security/advisories/GHSA-grwc-c762-gcvp","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":7.1,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/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":"2026-03-09T21:19:43.220Z"},"source":{"advisory":"GHSA-grwc-c762-gcvp","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-10T14:45:02.558778Z","id":"CVE-2026-28432","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":"2026-03-10T14:45:12.846Z"}}]}}}