CVE-2026-42180

תיאור (מקור, אנגלית)

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.

מדדים

CVSS 3.1

6.3 (MEDIUM) מקור הציון: CNA CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

EPSS — סבירות ניצול

0% (אחוזון 000) נכון ל-2/8/2026

CWE

CWE-918

קישורים

• https://github.com/LemmyNet/lemmy/releases/tag/0.19.18
• https://github.com/LemmyNet/lemmy/security/advisories/GHSA-3jvj-v6w2-h948
• https://github.com/LemmyNet/lemmy/security/advisories/GHSA-3jvj-v6w2-h948