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Medium severity6.1NVD Advisory· Published Mar 25, 2022· Updated Jul 9, 2026

CVE-2021-40906

CVE-2021-40906

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

39
  • Checkmk/Checkmk37 versions
    cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*+ 36 more
    • cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*range: >=1.5.0,<1.6.0
    • cpe:2.3:a:checkmk:checkmk:1.6.0:-:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:b10:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:b12:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:b1:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:b3:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:b4:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:b5:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:b9:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p10:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p11:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p12:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p13:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p14:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p15:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p16:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p19:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p1:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p20:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p21:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p22:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p23:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p24:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p25:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p2:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p3:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p4:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p5:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p6:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p7:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p8:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:1.6.0:p9:*:*:*:*:*:*
    • cpe:2.3:a:tribe29:checkmk:1.6.0b10:*:*:*:*:*:*:*
    • cpe:2.3:a:tribe29:checkmk:1.6.0b11:*:*:*:*:*:*:*
    • cpe:2.3:a:tribe29:checkmk:1.6.0p10:*:*:*:*:*:*:*
    • cpe:2.3:a:tribe29:checkmk:1.6.0p17:*:*:*:*:*:*:*
    • cpe:2.3:a:tribe29:checkmk:1.6.0p18:*:*:*:*:*:*:*
  • CheckMK/CheckMK Raw Editiondescription
  • Checkmk/CheckMK Raw Editionllm-create
    Range: 1.5.0 - 1.6.0

Patches

Vulnerability mechanics

News mentions

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