6.3

CVE-2026-33455: checkmk gmbh checkmk Improper Neutralization of Delimiters

CVSS: 6.3v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-33455
Published 10-04-2026Last modified 14-04-2026
Open JSON

Vulnerability summary

CVE-2026-33455 is a medium (CVSS 6.3) Improper Neutralization of Delimiters vulnerability in checkmk gmbh checkmk. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 20.3% of scored vulnerabilities.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.3/10
010
Medium · v3.1 (NVD)
EPSS score
0.29%
0%100%
Low · +0.11 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 10-04-2026
    PublishedVulnerability first disclosed.
  2. 14-04-2026
    Last modifiedVulnerability information updated.

Description

Livestatus injection in the monitoring quicksearch in Checkmk <2.5.0b4 allows an authenticated attacker to inject livestatus commands via the search query due to insufficient input sanitization in search filter plugins.

CVSS metrics

5 scores · 3 sources · 2 versions

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

+0.11 pp

From 0.18% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.29%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Checkmk1 product
  • checkmk2.5.0:b1 | 2.5.0:b2 | 2.5.0:b3
Checkmk gmbh1 product
Ubuntu1 product
  • check-mkAll versions (No fix recorded)

3 vendors · 3 products

References

3 links