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VulnerabilityPublished Updated

CVE-2023-6740: Checkmk · Uncontrolled Search Path Element

Affects CheckmkSource CVE Database V5

0

Not known to be exploited · CVSS 8.8 High · fixed in 2.2.0p18 : patch Checkmk soon.

Data as of 26 Oct 2026, 10:12 UTC

CVSS 3.1 base score
8.8High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 2.2.0p18, 2.1.0p38, 2.0.0p39
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 Jan 2024

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade Checkmk to 2.2.0p18, 2.1.0p38 or 2.0.0p39.

Affected software

ProductAffectedFixed in
Checkmk GmbH CheckmkAffected
  • <2.2.0p18
  • <2.1.0p38
  • <2.0.0p39
Fixed in
  • 2.2.0p18
  • 2.1.0p38
  • 2.0.0p39

AI-suggested

If you cannot patch yet, organizations should restrict local access to systems running vulnerable Checkmk versions, ensuring that only trusted administrators have shell or console access. Implement strict file system permissions and environment variable controls to prevent manipulation of search paths used by the jar_signature agent plugin. Conduct thorough audits of user privileges and remove unnecessary local accounts or limit their permissions. Employ application whitelisting and integrity monitoring to detect unauthorized changes to binaries or configuration files related to Checkmk. Network segmentation can reduce the risk of lateral movement if an attacker exploits this vulnerability. Additionally, monitor logs and system behavior for signs of privilege escalation attempts or unusual activity related to the Checkmk agent. Coordinating with Checkmk support and subscribing to vendor advisories will ensure timely awareness of patches and updates. Finally, incorporate this vulnerability into incident response plans to enable rapid containment if exploitation is suspected.

Description

Privilege escalation in jar_signature agent plugin in Checkmk before 2.2.0p18, 2.1.0p38 and 2.0.0p39 allows local user to escalate privileges

References

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