VYPR
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Medium severity5.4NVD Advisory· Published Jun 8, 2026· Updated Jun 9, 2026

CVE-2026-8833

CVE-2026-8833

Description

Improper neutralization of HTML-encoded characters in the URL validation function in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions allows an authenticated user to bypass URL validation and inject malicious URLs such as javascript: URIs, resulting in cross-site scripting when another user interacts with the crafted link.

AI Insight

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

Affected products

158
  • Checkmk/Checkmk158 versions
    cpe:2.3:a:checkmk:checkmk:2.2.0:-:*:*:*:*:*:*+ 157 more
    • 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:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.2.0:p37:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.2.0:p38:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.2.0:p39:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.2.0:p4:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.2.0:p40:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.2.0:p41:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.2.0:p42:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.2.0:p43:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.2.0:p44:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.2.0:p45:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.2.0:p46:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.2.0:p47:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.2.0:p5:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.2.0:p6:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.2.0:p7:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.2.0:p8:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.2.0:p9:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:-:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:b1:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:b2:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:b3:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:b4:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:b5:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:b6:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p1:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p10:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p11:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p12:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p13:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p14:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p15:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p16:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p17:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p18:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p19:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p2:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p20:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p21:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p22:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p23:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p24:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p25:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p26:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p27:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p28:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p29:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p3:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p30:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p31:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p32:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p33:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p34:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p35:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p36:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p37:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p38:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p39:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p4:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p40:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p41:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p42:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p43:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p44:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p45:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p46:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p47:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p5:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p6:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p7:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p8:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.3.0:p9:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:*:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:-:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:b1:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:b2:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:b3:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:b4:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:b5:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:b6:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p1:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p10:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p11:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p12:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p13:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p14:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p15:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p16:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p17:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p18:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p19:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p2:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p20:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p21:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p22:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p23:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p24:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p25:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p26:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p27:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p28:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p29:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p3:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p30:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p4:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p5:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p6:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p7:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p8:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.4.0:p9:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.5.0:-:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.5.0:b1:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.5.0:b2:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.5.0:b3:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.5.0:p1:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.5.0:p2:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.5.0:p3:*:*:*:*:*:*
    • cpe:2.3:a:checkmk:checkmk:2.5.0:p4:*:*:*:*:*:*
    • (no CPE)range: <2.5.0p5, <2.4.0p31, <2.3.0p48, all 2.2.0

Patches

Vulnerability mechanics

References

1

News mentions

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