CVE-2026-65840

CriticalCVSS 9.6/10Last modified Nov 12, 2026

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.

Metrics

CVSS 3.1 9.6/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Weakness enumeration

CWE-639

Affected software

Vendor	Product	Versions
getfider	fider	< 0.36.0

References

Timeline

Published: Nov 11, 2026
Last modified: Nov 12, 2026
NVD status: Deferred

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