Administrator account takeover via unencoded log entries
Published Apr 1, 2026 · Updated Apr 1, 2026
Stored cross-site scripting in CI4MS before 0.31.0.0 allows remote authenticated users to hijack administrator sessions through logged data. The Logs module inserts attacker-controlled error-message content into its administrative viewer without output encoding, so a stored payload executes as browser code. A low-privileged account must place a payload in application logs, and an administrator must later open the logs page; execution can expose or alter that administrator's account data.
Summary
What happened
Stored cross-site scripting in CI4MS before 0.31.0.0 allows remote authenticated users to hijack administrator sessions through logged data. The Logs module inserts attacker-controlled error-message content into its administrative viewer without output encoding, so a stored payload executes as browser code. A low-privileged account must place a payload in application logs, and an administrator must later open the logs page; execution can expose or alter that administrator's account data.
The record
- CVE
- CVE-2026-34560
- Published
- Apr 1, 2026
- Updated
- Apr 1, 2026
- Vendor
- Ci4MS
- Product
- CI4MS
- Classifications
- CWE-79, T1203
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 1, 2026CVE publishedPublication date reported by the CVE source.
- Apr 1, 2026Record 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=< 0.31.0.0
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
- GHSA-r4v5-rwr2-q7r4 exploit descriptionproof of concept · unverified
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Technologies
Your stack
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Your stack
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