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CVE-2026-33130— Uptime Kuma: SSTI in Notification Templates Allows Arbitrary File Read (Incomplete Fix for GHSA-vffh-c9pq-4crh)

Quick assessment

Affected
louislam uptime-kuma
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Uptime Kuma是Louis Lam个人开发者的一个易于使用的自托管监控工具。 Uptime Kuma 1.23.0至2.2.0版本存在安全漏洞，该漏洞源于服务器端模板注入防护不完全，可能导致读取服务器上的任意文件。

CVSS 6.5 · Medium EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-33130

Vulnerability Information
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Vulnerability Title
Uptime Kuma: SSTI in Notification Templates Allows Arbitrary File Read (Incomplete Fix for GHSA-vffh-c9pq-4crh)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
PHP程序中Include/Require语句包含文件控制不恰当(PHP远程文件包含)
Source: CVE Program / CVE List V5
Vulnerability Title
Uptime Kuma 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Uptime Kuma是Louis Lam个人开发者的一个易于使用的自托管监控工具。 Uptime Kuma 1.23.0至2.2.0版本存在安全漏洞，该漏洞源于服务器端模板注入防护不完全，可能导致读取服务器上的任意文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
louislam uptime-kuma >= 1.23.0, < 2.2.1 -

II. Public POCs for CVE-2026-33130

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III. Intelligence Information for CVE-2026-33130

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Vendor Advisories for CVE-2026-33130 (2)

Vendor Pages for CVE-2026-33130 (1)

IV. Related Vulnerabilities

Same product: uptime-kuma
Same vendor: louislam
Same weakness: CWE-98

V. Comments for CVE-2026-33130

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