{"id":"CVE-2026-65840","aliases":["EUVD-2026-123702","GHSA-vxjw-gv4f-vq58"],"status":"published","title":"Fider: Cross-Tenant Authentication Bypass via Missing tenant_id Filter in getVerificationByKey","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.","severity":{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"critical","assessor":"cna","from":"cve"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-639"],"published":"2026-11-11T18:32:50Z","modified":"2026-11-12T10:45:42Z","products":[{"vendor":"getfider","product":"fider"}],"references":[{"url":"https://github.com/getfider/fider/security/advisories/GHSA-vxjw-gv4f-vq58","tags":["x_refsource_CONFIRM","advisory"]},{"url":"https://github.com/getfider/fider/releases/tag/v0.36.0","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65840.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-65840","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-65840","title":"Fider: Cross-Tenant Authentication Bypass via Missing tenant_id Filter in getVerificationByKey","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.","status":"published","published":"2026-11-11T18:32:50.465Z","modified":"2026-11-11T18:32:50.465Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"critical","assessor":"cna"}],"cwes":["CWE-639"],"updated_at":"2026-11-11T19:31:49.923897Z"}],"euvd":[{"id":"EUVD-2026-123702","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.","status":"published","published":"2026-11-11T18:32:50Z","modified":"2026-11-11T18:32:50Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-11T19:30:03.578461Z"}],"nvd":[{"id":"CVE-2026-65840","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.","status":"published","published":"2026-11-11T19:17:43.937Z","modified":"2026-11-11T19:17:43.937Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"critical","assessor":"secondary"}],"cwes":["CWE-639"],"updated_at":"2026-11-11T21:26:20.111639Z"}],"osv":[{"id":"CVE-2026-65840","title":"Fider: Cross-Tenant Authentication Bypass via Missing tenant_id Filter in getVerificationByKey","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.","status":"published","published":"2026-11-11T18:32:50.465Z","modified":"2026-11-12T10:45:42.224431032Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-639"],"updated_at":"2026-11-12T11:17:24.122775Z"}]}}