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OpenAdvisories
Critical · 9.6 CVE-2026-65840 EUVD-2026-123702

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

Published Nov 11, 2026 · Updated Nov 12, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
getfider fider < 0.36.0 —

References