Is CVE-2026-33457 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-33457 being exploited in the wild.

How severe is CVE-2026-33457?

Medium severity, with a CVSS score of 6.3, published 10 April 2026.

Which products and versions are affected?

Checkmk Checkmk < 2.5.0b4, < 2.4.0p26, < 2.3.0p47.

Is there a fix for CVE-2026-33457?

A patch was published on 2026-03-23: Vendor fix released (Werk #17990) Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-33457 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-33457?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-33457: Checkmk Livestatus injection in prediction graph page

Q: Which products and versions are affected?

Checkmk Checkmk < 2.5.0b4, < 2.4.0p26, < 2.3.0p47.

Q: Is there a fix for CVE-2026-33457?

A patch was published on 2026-03-23: Vendor fix released (Werk #17990) Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-33457 attacked?

It is attacked over the network, in a network appliance.

Q: Am I affected by CVE-2026-33457?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-33457 · Severity: medium · CVSS 6.3 · Published 2026-04-10

Checkmk is an IT infrastructure monitoring platform used to track the health of servers and networks. A security flaw in its prediction graph page allows an authorized user to bypass normal data restrictions by injecting malicious commands. This could allow a user with low-level access to view or modify monitoring data they should not be able to reach, potentially impacting the integrity of system reports.

Quick answers

Is CVE-2026-33457 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-33457 being exploited in the wild.
How severe is CVE-2026-33457?: Medium severity, with a CVSS score of 6.3, published 10 April 2026.
Which products and versions are affected?: Checkmk Checkmk < 2.5.0b4, < 2.4.0p26, < 2.3.0p47.
Is there a fix for CVE-2026-33457?: A patch was published on 2026-03-23: Vendor fix released (Werk #17990) Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-33457 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-33457?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A Livestatus injection vulnerability exists in Checkmk's user interface, specifically within the prediction graph page. The root cause is the improper neutralization of delimiters (CWE-140) where user-supplied service description values are interpolated into Livestatus queries without sufficient sanitization. An authenticated attacker with network access can exploit this by providing a crafted service name parameter to execute arbitrary Livestatus commands. This could lead to unauthorized data retrieval or modification within the monitoring core. The issue is addressed in versions 2.5.0b4, 2.4.0p26, and 2.3.0p47.

Affected products

Checkmk Checkmk < 2.5.0b4, < 2.4.0p26, < 2.3.0p47

Timeline

2026-03-23: patched: Vendor fix released (Werk #17990)
2026-04-10: disclosed: Initial CVE publication
2026-04-20: advisory: NIST NVD analysis updated

References

https://checkmk.com/werk/17990

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