CVE-2026-33130

MEDIUM EPSS 25.9%
Published Mar 20, 20263mo ago · Modified Jun 17, 20262w ago
6.5 CVSS 3.1
Medium
Find Similar
Published Mar 20, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
6.5
Exploitability
2.8
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability None

Threat Intelligence

EPSS Exploit Probability
25.9% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 2

CWE-1336
CWE-98

Affected Products 1

VendorProductVersionRange
uptime.kumauptime_kuma*≥1.23.0  –  <2.2.1

References 3

  • github.com https://github.com/advisories/GHSA-vffh-c9pq-4crh
    ExploitMitigationVendor Advisory
  • github.com https://github.com/louislam/uptime-kuma/releases/tag/2.2.1
    PatchProduct
  • github.com https://github.com/louislam/uptime-kuma/security/advisories/GHSA-v832-4r73-wx5j
    ExploitMitigationVendor Advisory

Remediation

  • github.com https://github.com/louislam/uptime-kuma/releases/tag/2.2.1
    PatchProduct