getfider Fider up to 0.35.x Multi-Tenant Mode improper authorization

Summaryinfo

A vulnerability was found in getfider Fider up to 0.35.x. It has been classified as critical. Affected is an unknown function of the component Multi-Tenant Mode. Performing a manipulation results in improper authorization. This vulnerability is identified as CVE-2026-65840. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in getfider Fider up to 0.35.x. This affects an unknown code block of the component Multi-Tenant Mode. The manipulation with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-65840 since 07/23/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

Upgrading to version 0.36.0 eliminates this vulnerability.

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Productinfo

Vendor

• getfider

Name

• Fider

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29
• 0.30
• 0.31
• 0.32
• 0.33
• 0.34
• 0.35

Website

• Product: https://github.com/getfider/fider/

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