CVE-2024-38860Network attack vector

Phishing via unescaped SAML error links

Published Sep 17, 2024 · Updated Sep 17, 2024

Cross-site scripting in Checkmk before 2.3.0p16 and 2.2.0p34 allows remote attackers to facilitate phishing through crafted URLs. The SAML login page renders attacker-controlled URLs as clickable HTML links in its error box instead of escaping them. At least one SAML connection must be configured, and a user must open the crafted URL and click the displayed link.

CVSS severity5.1
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Checkmk before 2.3.0p16 and 2.2.0p34 allows remote attackers to facilitate phishing through crafted URLs. The SAML login page renders attacker-controlled URLs as clickable HTML links in its error box instead of escaping them. At least one SAML connection must be configured, and a user must open the crafted URL and click the displayed link.

The record

CVE
CVE-2024-38860
Published
Sep 17, 2024
Updated
Sep 17, 2024
Vendor
Checkmk GmbH
Product
Checkmk
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.2.0 <2.2.0p34
  2. Affected versionversion=2.3.0 <2.3.0p16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Checkmk GmbH · Checkmkversion=2.2.0 <2.2.0p34; version=2.3.0 <2.3.0p16

Published CVSS scores

5.1Checkmk GmbHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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