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CVE-2026-8833

XSS in urls

MEDIUM
5.4
CVSS Score
Published: June 8, 2026 at 12:06 PM UTC
Updated: October 23, 2026 at 09:10 PM UTC
1 product affected across 1 vendorCheckmk

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Checkmk· Checkmk
95%
2.2.02.2.0 b12.2.0 b22.2.0 b32.2.0 b42.2.0 b52.2.0 b62.2.0 b72.2.0 b82.2.0 i12.2.0 p12.2.0 p102.2.0 p112.2.0 p122.2.0 p132.2.0 p142.2.0 p152.2.0 p162.2.0 p172.2.0 p182.2.0 p192.2.0 p22.2.0 p202.2.0 p212.2.0 p222.2.0 p232.2.0 p242.2.0 p252.2.0 p262.2.0 p272.2.0 p282.2.0 p292.2.0 p32.2.0 p302.2.0 p312.2.0 p322.2.0 p332.2.0 p342.2.0 p352.2.0 p362.2.0 p372.2.0 p382.2.0 p392.2.0 p42.2.0 p402.2.0 p412.2.0 p422.2.0 p432.2.0 p442.2.0 p452.2.0 p462.2.0 p472.2.0 p52.2.0 p62.2.0 p72.2.0 p82.2.0 p92.3.02.3.0 b12.3.0 b22.3.0 b32.3.0 b42.3.0 b52.3.0 b62.3.0 p12.3.0 p102.3.0 p112.3.0 p122.3.0 p132.3.0 p142.3.0 p152.3.0 p162.3.0 p172.3.0 p182.3.0 p192.3.0 p22.3.0 p202.3.0 p212.3.0 p222.3.0 p232.3.0 p242.3.0 p252.3.0 p262.3.0 p272.3.0 p282.3.0 p292.3.0 p32.3.0 p302.3.0 p312.3.0 p322.3.0 p332.3.0 p342.3.0 p352.3.0 p362.3.0 p372.3.0 p382.3.0 p392.3.0 p42.3.0 p402.3.0 p412.3.0 p422.3.0 p432.3.0 p442.3.0 p452.3.0 p462.3.0 p472.3.0 p52.3.0 p62.3.0 p72.3.0 p82.3.0 p92.4.02.4.0 b12.4.0 b22.4.0 b32.4.0 b42.4.0 b52.4.0 b62.4.0 p12.4.0 p102.4.0 p112.4.0 p122.4.0 p132.4.0 p142.4.0 p152.4.0 p162.4.0 p172.4.0 p182.4.0 p192.4.0 p22.4.0 p202.4.0 p212.4.0 p222.4.0 p232.4.0 p242.4.0 p252.4.0 p262.4.0 p272.4.0 p282.4.0 p292.4.0 p32.4.0 p302.4.0 p42.4.0 p52.4.0 p62.4.0 p72.4.0 p82.4.0 p92.5.02.5.0 b12.5.0 b22.5.0 b32.5.0 p12.5.0 p22.5.0 p32.5.0 p4
Affected range stops below 2.3.0p48, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.4.0p31, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.5.0p5, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://checkmk.com/werk/20002

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-79

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