{"affected":[{"defaultStatus":"unaffected","ecosystem":"github","packageName":"logchimp/logchimp","product":"logchimp","source":"CNA: VulnCheck","vendor":"logchimp","versions":[{"lessThan":"0.9.3","status":"affected","version":"0.9.0-alpha.1","versionType":"semver"}]}],"cveId":"CVE-2026-121560","cwes":["CWE-639"],"description":"LogChimp 0.9.0-alpha.1 before 0.9.3 contains an authorization bypass vulnerability that allows authenticated post authors to modify any other post by supplying mismatched postId and id body parameters. Attackers can set postId to their own post and id to an enumerated victim post UUID to overwrite its title, slug, content, boardId and roadmap_id.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":7.1,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N","version":"4.0"},{"score":7.1,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L","version":"3.1"},{"score":7.1,"severity":"high","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"},{"score":7.1,"severity":"high","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L","version":"3.1"}],"modifiedAt":1793726290897,"publishedAt":1793719036390,"references":[{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/logchimp/logchimp/commit/a78b69af342908472ad400285187e43729295a7c"},{"source":"CNA: VulnCheck","tags":["product"],"url":"https://github.com/logchimp/logchimp"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/logchimp/logchimp/blob/v0.9.2/packages/server/src/controllers/post/updatePost.ts#L67"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/logchimp/logchimp/blob/v0.9.2/packages/server/src/middlewares/postExists.ts#L72-L77"},{"source":"CNA: VulnCheck","tags":["technical-description","release-notes"],"url":"https://github.com/logchimp/logchimp/releases/tag/v0.9.3"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/logchimp-before-0.9.3-authorization-bypass-via-patch-api-v1-posts"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/logchimp/logchimp"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/logchimp/logchimp/blob/v0.9.2/packages/server/src/controllers/post/updatePost.ts#L67"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/logchimp/logchimp/blob/v0.9.2/packages/server/src/middlewares/postExists.ts#L72-L77"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/logchimp/logchimp/commit/a78b69af342908472ad400285187e43729295a7c"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/logchimp/logchimp/releases/tag/v0.9.3"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/logchimp-before-0.9.3-authorization-bypass-via-patch-api-v1-posts"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/logchimp/logchimp/commit/a78b69af342908472ad400285187e43729295a7c"}],"revision":"b632b7a2a117e7d4a8e31281e8aa0469c2906db854c1990e29d245263d1dc37b","sources":[{"modifiedAt":1793724149845,"name":"CNA: VulnCheck","retrievedAt":1793725916998,"url":"https://www.cve.org/CVERecord?id=CVE-2026-121560"},{"modifiedAt":1793726290897,"name":"NVD","retrievedAt":1793730106532,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121560"}],"ssvc":{"assessedAt":1793724132790,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"LogChimp before 0.9.3 Authorization Bypass via PATCH /api/v1/posts","updatedAt":1793730106532}