XSS in Checkmk
CVE-2021-40906
CheckMK Raw Edition software (versions 1.5.0 to 1.6.0) does not sanitise the input of a web service parameter that is in an unauthenticated zone. This Reflected XSS allows an attacker to open a backdoor on the device with HTML content and interpreted by the browser (such as JavaScript or other client-side scripts) or to steal the session cookies of a user who has previously authenticated via a man in the middle. Successful exploitation requires access to the web service resource without authentication.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.010 (61.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 62nd percentile — 61.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- Checkmk — versions 1.6.0
- Tribe29 Checkmk — versions 1.6.0b10, 1.6.0b11, 1.6.0p10
Weakness classification (CWE)
Public proof-of-concept exploits
References
- af854a3a-2127-422b-91ae-364da2661108 (Product)
- github.com/Edgarloyola/CVE-2021-40906 (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-40906?
- CVE-2021-40906 is a medium-severity vulnerability in Checkmk, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-03-25.
- How severe is CVE-2021-40906?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2021-40906 known to be exploited?
- 9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.