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CVE-2026-9549

4.8 medium SSVC exploitation: none Analyzed
NVD · CVE.org

Stored cross-site scripting in the service discovery active check output in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions allows an administrator who can configure active or custom checks to inject malicious HTML or JavaScript into check output that executes in the browser of an admin or a user with host read permissions when they run the check on the service discovery page.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 4.8 · checkmkNVD modified 2026-10-23 22:10

Affected (CPE criteria) 157

  • cpe:2.3:a:checkmk:checkmk:2.2.0:-:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:b1:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:b2:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:b3:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:b4:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:b5:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:b6:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:b7:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:b8:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:i1:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p1:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p10:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p11:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p12:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p13:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p14:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p15:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p16:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p17:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p18:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p19:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p2:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p20:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p21:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p22:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p23:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p24:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p25:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p26:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p27:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p28:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p29:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p3:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p30:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p31:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p32:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p33:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p34:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p35:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p36:*:*:*:*:*:*
  • and 117 more

References 1