CVE-2025-39666: checkmk gmbh checkmk Untrusted Search Path
CVSS: 9.3v4.0CriticalAnalyzed
AliasesUBUNTU-CVE-2025-39666
Published 07-04-2026Last modified 07-04-2026
Vulnerability summary
CVE-2025-39666 is a critical (CVSS 9.3) Untrusted Search Path vulnerability in checkmk gmbh checkmk. EPSS estimates a 0.12% chance of exploitation in the next 30 days, higher than 1.7% of scored vulnerabilities.
CVSS score
9.3/10
010
Critical · v4.0 (CVE.org)EPSS score
0.12%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 07-04-2026PublishedVulnerability first disclosed.
- 07-04-2026Last modifiedVulnerability information updated.
Description
Local privilege escalation in Checkmk 2.2.0 (EOL), Checkmk 2.3.0 before 2.3.0p46, Checkmk 2.4.0 before 2.4.0p25, and Checkmk 2.5.0 (beta) before 2.5.0b3 allows a site user to escalate their privileges to root, by manipulating files in the site context that are processed when the `omd` administrative command is run by root.
CVSS metrics
5 scores · 3 sources · 2 versionsCritical 9.3Preferred score · CVE.org (CNA)
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated9.3CriticalCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- NVDNIST9.3CriticalCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
High 7.3Preferred score · OSV · Ubuntu (Ecosystem advisory) · calculated from vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:HSourcesAll 2 agree
- NVDNIST7.3HighCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.12%
Chance of exploitation in the next 30 days
Percentile
2%
Versus all other CVEs
30-day change
0.00 pp
From 0.12% on 20-09-2026
20-09-202620-10-2026
EPSS score0.12%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-426Untrusted Search PathThe product searches for critical resources using an externally-supplied search path that can point to resources that are not under the product's direct control.
- CWE-829Inclusion of Functionality from Untrusted Control SphereThe product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere.
Affected systems
Checkmk1 product
- checkmkEOL2.2.0 | 2.2.0:b1 | 2.2.0:b2 | 2.2.0:b3 | 2.2.0:b4 | 2.2.0:b5 | 2.2.0:b6 | 2.2.0:b7 | 2.2.0:b8 | 2.2.0:i1 | 2.2.0:p1 | 2.2.0:p10 | 2.2.0:p11 | 2.2.0:p12 | 2.2.0:p13 | 2.2.0:p14 | 2.2.0:p15 | 2.2.0:p16 | 2.2.0:p17 | 2.2.0:p18 | 2.2.0:p19 | 2.2.0:p2 | 2.2.0:p20 | 2.2.0:p21 | 2.2.0:p22 | 2.2.0:p23 | 2.2.0:p24 | 2.2.0:p25 | 2.2.0:p26 | 2.2.0:p27 | 2.2.0:p28 | 2.2.0:p29 | 2.2.0:p3 | 2.2.0:p30 | 2.2.0:p31 | 2.2.0:p32 | 2.2.0:p33 | 2.2.0:p34 | 2.2.0:p35 | 2.2.0:p36 | 2.2.0:p37 | 2.2.0:p38 | 2.2.0:p39 | 2.2.0:p4 | 2.2.0:p40 | 2.2.0:p41 | 2.2.0:p42 | 2.2.0:p43 | 2.2.0:p44 | 2.2.0:p45 | 2.2.0:p46 | 2.2.0:p47 | 2.2.0:p5 | 2.2.0:p6 | 2.2.0:p7 | 2.2.0:p8 | 2.2.0:p9 | 2.3.0 | 2.3.0:b1 | 2.3.0:b2 | 2.3.0:b3 | 2.3.0:b4 | 2.3.0:b5 | 2.3.0:b6 | 2.3.0:p1 | 2.3.0:p10 | 2.3.0:p11 | 2.3.0:p12 | 2.3.0:p13 | 2.3.0:p14 | 2.3.0:p15 | 2.3.0:p16 | 2.3.0:p17 | 2.3.0:p18 | 2.3.0:p19 | 2.3.0:p2 | 2.3.0:p20 | 2.3.0:p21 | 2.3.0:p22 | 2.3.0:p23 | 2.3.0:p24 | 2.3.0:p25 | 2.3.0:p26 | 2.3.0:p27 | 2.3.0:p28 | 2.3.0:p29 | 2.3.0:p3 | 2.3.0:p30 | 2.3.0:p31 | 2.3.0:p32 | 2.3.0:p33 | 2.3.0:p34 | 2.3.0:p35 | 2.3.0:p36 | 2.3.0:p37 | 2.3.0:p38 | 2.3.0:p39 | 2.3.0:p4 | 2.3.0:p40 | 2.3.0:p41 | 2.3.0:p42 | 2.3.0:p43 | 2.3.0:p44 | 2.3.0:p45 | 2.3.0:p5 | 2.3.0:p6 | 2.3.0:p7 | 2.3.0:p8 | 2.3.0:p9 | 2.4.0 | 2.4.0:b1 | 2.4.0:b2 | 2.4.0:b3 | 2.4.0:b4 | 2.4.0:b5 | 2.4.0:b6 | 2.4.0:p1 | 2.4.0:p10 | 2.4.0:p11 | 2.4.0:p12 | 2.4.0:p13 | 2.4.0:p14 | 2.4.0:p15 | 2.4.0:p16 | 2.4.0:p17 | 2.4.0:p18 | 2.4.0:p19 | 2.4.0:p2 | 2.4.0:p20 | 2.4.0:p21 | 2.4.0:p22 | 2.4.0:p23 | 2.4.0:p24 | 2.4.0:p3 | 2.4.0:p4 | 2.4.0:p5 | 2.4.0:p6 | 2.4.0:p7 | 2.4.0:p8 | 2.4.0:p9 | 2.5.0:b1 | 2.5.0:b2
Checkmk gmbh1 product
- checkmkEOL2.2.0 | ≥ 2.3.0, < 2.3.0p46 | ≥ 2.4.0, < 2.4.0p25 | ≥ 2.5.0b1, < 2.5.0b3
Ubuntu1 product
- check-mkAll versions (No fix recorded)
3 vendors · 3 products