CVE-2023-49276: Uptime Kuma is an open source self-hosted monitoring tool

Routine

MEDIUM 6.3UPGRADE

CVE-2023-49276 is a medium-severity flaw (CVSS 6.3) affecting uptime kuma. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Uptime Kuma is an open source self-hosted monitoring tool. In affected versions the Google Analytics element in vulnerable to Attribute Injection leading to Cross-Site-Scripting (XSS). Since the custom status interface can set an independent Google Analytics ID and the template has not been sanitized, there is an attribute injection vulnerability here, which can lead to XSS attacks. This vulnerability has been addressed in commit `f28dccf4e` whic

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-12-01
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: uptime.kuma

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-12-01 22:15 UTCPublished CVE record published
2026-06-17 06:35 UTCUpdated Record last modified

uptime.kuma uptime kuma UPGRADE

Affected: >= 1.20.0 and < 1.23.7

Fixed in: 1.23.7

Safe to downgrade to: a release before 1.20.0

1. Check installed version

apt-cache policy uptime-kuma || rpm -q uptime-kuma || uptime-kuma --version

2. UPGRADE to 1.23.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade uptime-kuma

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade uptime-kuma

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.20.0 (Debian / Ubuntu)

apt-cache madison uptime-kuma sudo apt install uptime-kuma=<VERSION_BEFORE_1.20.0> sudo apt-mark hold uptime-kuma

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list uptime-kuma sudo dnf downgrade uptime-kuma-<VERSION_BEFORE_1.20.0> sudo dnf versionlock add uptime-kuma

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-49276?

uptime kuma: upgrade to 1.23.7. Exact commands for each OS are on this page.

Is CVE-2023-49276 being exploited?

CVE-2023-49276 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-49276 affect?

CVE-2023-49276 affects uptime kuma. Severity is medium (CVSS 6.3). Uptime Kuma is an open source self-hosted monitoring tool. In affected versions the Google Analytics element in vulnerable to Attribute Injection leading to Cross-Site-Scripting (XSS). Since the custom status interface can set an independen

How urgent is CVE-2023-49276?

Priority 38/100. Public exploit reference

Related CVEs

CVE-2026-33130 MEDIUM 6.5 UPGRADE Uptime Kuma is an open source, self-hosted monitoring tool
CVE-2026-32230 MEDIUM 5.3 UPGRADE Uptime Kuma is an open source, self-hosted monitoring tool
CVE-2023-49805 MEDIUM 6.0 UPGRADE UPGRADE Uptime Kuma is an easy-to-use self-hosted monitoring tool
CVE-2023-49804 MEDIUM 6.7 UPGRADE UPGRADE Uptime Kuma is an easy-to-use self-hosted monitoring tool
CVE-2023-44400 MEDIUM 6.7 UPGRADE Uptime Kuma is a self-hosted monitoring tool

References

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