CVE-2023-25811: Persistent Cross site scripting (XSS) in Uptime Kuma

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-02-21 · updated 2026-06-17
Weakness: CWE-79

Description

Uptime Kuma is a self-hosted monitoring tool. In versions prior to 1.20.0 the Uptime Kuma `name` parameter allows a persistent XSS attack. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

louislam uptime-kuma: before 1.20.0 — fixed in 1.20.0

How to fix

Upgrade to a fixed version: louislam uptime-kuma 1.20.0. Check the vendor advisory for mitigations.

References

https://github.com/louislam/uptime-kuma/security/advisories/GHSA-553g-fcpf-m3wp
https://github.com/louislam/uptime-kuma/security/advisories/GHSA-553g-fcpf-m3wp

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