CVE-2026-102877

Medium

Description

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.

SeverityMedium

CVSS4.4

Exploit probability—

Product

Fider

PublishedSep 29, 2026

First seenSep 29, 2026

Weakness typeCWE-918Server-side request forgery (SSRF)

How to fix

Update

getfider fider0.38.0 or later

Patches

github.com/getfider/fider/commit/45f5627b9fd15b912fb9092635c863fb4c91dd69

Vendor advisories

Affected products

Product	Affected versions	Fixed in
getfider fider	v < 0.38.0	0.38.0

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