Email Verification Bypass in Fider Feedback Portal by GetFider
CVE-2026-65840

9.6CRITICAL

Key Information:

Vendor

Getfider

Status
Fider
Vendor
CVE Published:
11 November 2026

What is CVE-2026-65840?

Fider, a feedback portal designed for feature requests, has a flaw in its multi-tenant mode that allows an attacker to leverage an email verification key from Tenant A to gain unauthorized access to accounts on Tenant B. This vulnerability undermines tenant isolation, enabling potential cross-tenant account breaches. Fortunately, the issue has been resolved in version 0.36.0, mitigating the risks associated with this security lapse.

Affected Version(s)

fider < 0.36.0

References

https://github.com/getfider/fider/security/advisories/GHS...
x_refsource_CONFIRM
https://github.com/getfider/fider/releases/tag/v0.36.0
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CVSS V3.1

Score:
9.6
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.