Is CVE-2026-102877 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-102877?

CVE-2026-102877 has a CVSS v3 severity of MEDIUM (4.4).

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CVE-2026-102877

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.