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.

CVSS v3.1

6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v2.0

4.3 MEDIUMAV:N/AC:M/Au:N/C:N/I:P/A:N

EPSS

0.99% chance of exploitation in the next 30 days, 60th percentile

Published

2022-03-25

Updated

2026-07-09

Proof-of-concept exploits (1)

• Edgarloyola/CVE-2021-409061★ · 2022-04-22

References

• CVE Record
• NVD entry

Related

• CVE-2021-36563
• CVE-2021-40904
• CVE-2021-40905
• CVE-2021-40907
• CVE-2021-40908
• CVE-2021-40903