by Kastro
Paper/Archive/CVE-2026-65840

CVE-2026-65840

getfider fider — Fider: Cross-Tenant Authentication Bypass via Missing tenant_id Filter in getVerificationByKey

CVSS 9.6
critical.is priorityof 100
29
CVSS 9.6 (CNA)9.6 / 10 × 3028.8Not in CISA KEV+300.0No EPSS score.000 × 200.0No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
fider< 0.36.0–CNA

Scores by source

GitHub_M (CNA)9.6CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

References

refgithub.com/getfider/fider/security/advisories/GHSA-vxjw-gv4f-vq58refgithub.com/getfider/fider/releases/tag/v0.36.0