Email content injection via unsanitized notification HTML
Published Mar 20, 2023 · Updated Feb 26, 2025
HTML injection in affected Checkmk releases allows remote authenticated users to insert malicious markup into email notifications. The Insert HTML section between body and table setting passes attacker-controlled markup into generated messages without the usual sanitization. The attacker needs permission to configure HTML notifications, and exploitation depends on a recipient viewing the crafted message; the reported impact is limited to information disclosure.
Summary
What happened
HTML injection in affected Checkmk releases allows remote authenticated users to insert malicious markup into email notifications. The Insert HTML section between body and table setting passes attacker-controlled markup into generated messages without the usual sanitization. The attacker needs permission to configure HTML notifications, and exploitation depends on a recipient viewing the crafted message; the reported impact is limited to information disclosure.
The record
- CVE
- CVE-2023-22288
- Published
- Mar 20, 2023
- Updated
- Feb 26, 2025
- Vendor
- Checkmk GmbH
- Product
- Checkmk
- Classifications
- CWE-138, CWE-79, CAPEC-242
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 20, 2023CVE publishedPublication date reported by the CVE source.
- Feb 26, 2025Record 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.
- Affected versionversion=1.6.0 <=1.6.0p30
- Affected versionversion=2.0.0 <=2.0.0p34
- Affected versionversion=2.1.0 <=2.1.0p23
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
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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