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CVE-2026-8833

XSS in urls

High8.5EPSS 0.14%
Published
Updated
Reserved
Assigned by
Checkmk

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.

Scores

CVSS scores of CVE-2026-8833, by who scored it
Scored byCVSSScoreVector
CheckmkCNA (assigner)4.0High8.5CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:L/SA:N
NVDNVD · Analyzed4.0High8.5CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS (exploitation in 30 days)
0.14% · top 97% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.5.

Weakness

Affected products

  • Checkmk GmbH · Checkmk

    • affected 2.5.0 – < 2.5.0p5
    • affected 2.4.0 – < 2.4.0p31
    • affected 2.3.0 – < 2.3.0p48
    • affected 2.2.0

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .