CVE-2023-26777: Cross Site Scripting vulnerability found in : louislam Uptime Kuma v.1.19.6 and before allows a remote attacke

Q: How do I fix CVE-2023-26777?

uptime kuma: upgrade to newer than 1.19.6. Exact commands for each OS are on this page.

Q: Is CVE-2023-26777 being exploited?

CVE-2023-26777 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-26777 affect?

CVE-2023-26777 affects uptime kuma. Severity is medium (CVSS 6.1). Cross Site Scripting vulnerability found in : louislam Uptime Kuma v.1.19.6 and before allows a remote attacker to execute arbitrary commands via the description, title, footer, and incident creation parameter of the status_page.js endpoint

Q: How urgent is CVE-2023-26777?

Priority 34/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2023-26777 is a medium-severity flaw (CVSS 6.1) affecting uptime kuma. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross Site Scripting vulnerability found in : louislam Uptime Kuma v.1.19.6 and before allows a remote attacker to execute arbitrary commands via the description, title, footer, and incident creation parameter of the status_page.js endpoint.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-04-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: uptime kuma project

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

Am I affected?

Timeline

2023-04-04 15:15 UTCPublished CVE record published
2026-06-17 05:43 UTCUpdated Record last modified

uptime kuma project uptime kuma UPGRADE

Affected: <= 1.19.6

Fixed in: newer than 1.19.6

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.19.6 (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.

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-2023-26777?

uptime kuma: upgrade to newer than 1.19.6. Exact commands for each OS are on this page.

Is CVE-2023-26777 being exploited?

CVE-2023-26777 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-2023-26777 affect?

CVE-2023-26777 affects uptime kuma. Severity is medium (CVSS 6.1). Cross Site Scripting vulnerability found in : louislam Uptime Kuma v.1.19.6 and before allows a remote attacker to execute arbitrary commands via the description, title, footer, and incident creation parameter of the status_page.js endpoint

How urgent is CVE-2023-26777?

Priority 34/100. No elevated risk signals yet.

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-2023-49276 MEDIUM 6.3 UPGRADE Uptime Kuma is an open source self-hosted monitoring tool

References

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