{"affected":[{"product":"fider","source":"CNA: GitHub_M","vendor":"getfider","versions":[{"status":"affected","version":"< 0.36.0"}]}],"cveId":"CVE-2026-65840","cwes":["CWE-639"],"description":"Fider is a feedback portal for feature requests and suggestions. Prior to version 0.36.0, in multi-tenant mode (HOST_MODE=multi), an attacker can use an email verification key issued by Tenant A to authenticate as the same email address on Tenant B. This completely bypasses tenant isolation and allows unauthorized account takeover across tenants. Single-host deployments (HOST_MODE=single, the default) are NOT affected. This issue has been patched in version 0.36.0.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":9.6,"severity":"critical","source":"CNA: GitHub_M","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","version":"3.1"}],"modifiedAt":1794421970465,"publishedAt":1794421970465,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/getfider/fider/security/advisories/GHSA-vxjw-gv4f-vq58"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/getfider/fider/releases/tag/v0.36.0"}],"remediation":[],"revision":"117ff6a69198875983d16bf1bd12746c24998044549be7fd3fe53dec9d986eb0","sources":[{"modifiedAt":1794421970465,"name":"CNA: GitHub_M","retrievedAt":1794424162166,"url":"https://www.cve.org/CVERecord?id=CVE-2026-65840"}],"ssvc":null,"status":"published","title":"Fider: Cross-Tenant Authentication Bypass via Missing tenant_id Filter in getVerificationByKey","updatedAt":1794424162166}