Threats Tagged 'cve-2026-42180'
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Threats Tagged 'cve-2026-42180'
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Lemmy is a link aggregator and forum for the fediverse. Prior to version 0.19.18, Lemmy allows an authenticated low-privileged user to create a link post through POST /api/v3/post. When a post is created in a public community, the backend asynchronously sends a Webmention to the attacker-controlled link target. The submitted URL is checked for syntax and scheme, but the audited code path does not reject loopback, private, or link-local destinations before the Webmention request is issued. This lets a normal user trigger server-side HTTP requests toward internal services. This issue has been patched in version 0.19.18. Join the discussion | CVE Database V5 | 05/08/2026, 19:29:04 UTC Added: 05/08/2026, 20:06:26 UTC |
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