EUVD-2026-13670CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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3Tags
Description
Uptime Kuma is an open source, self-hosted monitoring tool. In versions 1.23.0 through 2.2.0, the fix from GHSA-vffh-c9pq-4crh doesn't fully work to preventServer-side Template Injection (SSTI). The three mitigations added to the Liquid engine (root, relativeReference, dynamicPartials) only block quoted paths. If a project uses an unquoted absolute path, attackers can still read any file on the server. The original fix in notification-provider.js only constrains the first two steps of LiquidJS's file resolution (via root, relativeReference, and dynamicPartials options), but the third step, the require.resolve() fallback in liquid.node.js has no containment check, allowing unquoted absolute paths like /etc/passwd to resolve successfully. Quoted paths happen to be blocked only because the literal quote characters cause require.resolve('"/etc/passwd"') to throw a MODULE_NOT_FOUND error, not because of any intentional security measure. This issue has been fixed in version 2.2.1.
Analysis
Uptime Kuma versions 1.23.0 through 2.2.0 contain an incomplete Server-Side Template Injection (SSTI) vulnerability in the LiquidJS templating engine that allows authenticated attackers to read arbitrary files from the server. A prior fix (GHSA-vffh-c9pq-4crh) attempted to restrict file path access through three mitigation options (root, relativeReference, dynamicPartials), but this fix only blocks quoted paths; attackers can bypass the mitigation by using unquoted absolute paths like /etc/passwd that successfully resolve through the require.resolve() fallback mechanism in liquid.node.js. …
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Remediation
Within 30 days: Identify affected systems running versions 1.23.0 and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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