Security Advisory

CVE-2026-71246

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-08-05 10:56:57

Last updated 2026-08-05 12:52:19

Assigner TuranSec

CVSS score not scored

State PUBLISHED

Description

Pixelfed's SearchController (behind the auth middleware) accepts a URL via its remote-search parameters and fetches it server-side through ActivityPubFetchService, whose validateUrl() only blocks the literal hosts 127.0.0.1, localhost, and ::1 and requires https, without checking the resolved IP against private, internal, or link-local ranges (e.g. 169.254.169.254). Optional DNS validation is disabled by default and, when enabled, only confirms a DNS record exists without filtering by IP range. The fetch response body is returned to the requester only when the Content-Type matches an ActivityPub content type, making this a semi-blind but authenticated SSRF primitive reachable by any logged-in user.

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