getfider Fider up to 0.37.x URL Validation server-side request forgery

Summaryinfo

A vulnerability marked as problematic has been reported in getfider Fider up to 0.37.x. Impacted is an unknown function of the component URL Validation. The manipulation leads to server-side request forgery. This vulnerability is traded as CVE-2026-102877. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in getfider Fider up to 0.37.x. This issue affects an unknown code of the component URL Validation. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Fider before 0.38.0 contains a server-side request forgery vulnerability due to a time-of-check time-of-use gap in URL validation for webhooks and custom OAuth provider endpoints. Administrators controlling DNS can perform DNS rebinding attacks to make the Fider server send requests to internal services or cloud metadata endpoints.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-102877 since 09/29/2026. The exploitation is known to be easy. The attack may be initiated remotely. Additional levels of successful authentication are needed for exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 0.38.0 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
• 0.36
• 0.37

Website

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

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