Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
STABLE
CVE-2026-42180 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… https://www.cve.org/CVERecord?id=CVE-2026-42180
Post summary
The text announces CVE‑2026‑42180, noting that a low‑privileged authenticated user can create link posts; the vulnerability is fixed in Lemmy version 0.19.18.
CVE-2026-42180 Server-Side Request Forgery in Lemmy Prior to Version 0.19.18 https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-42180
Post summary
CVE‑2026‑42180 is a newly disclosed SSRF vulnerability affecting Lemmy versions before 0.19.18, with no evidence of active exploitation, PoC, exploit tool, or patch mentioned in the text.