CVE-2026-39391: ci4-cms-erp ci4ms · Cross-site Scripting
Affects ci4-cms-erp ci4msSource CVE Database V5
Not known to be exploited · CVSS 4.8 Medium : upgrade to 0.31.4.0 when convenient.
Data as of 29 Oct 2026, 19:04 UTC
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 13% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 0.31.4.0
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 8 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
Upgrade ci4ms and ci4-cms-erp/ci4ms to 0.31.4.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| ci4-cms-erpci4ms | Affected
| Fixed in
|
GitHubci4-cms-erp/ci4mspkg:github/ci4-cms-erp/ci4msOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
This vulnerability is fixed in ci4ms version 0.31.4.0. Users should upgrade to version 0.31.4.0 or later to remediate the issue. No other official remediation or temporary fixes are documented. Patch status is not explicitly stated beyond the fix in 0.31.4.0, so verify with the vendor advisory for the latest guidance.
Description
CVE-2026-39391 is a cross-site scripting (XSS) vulnerability in the ci4ms product of the ci4-cms-erp project. The issue occurs in versions prior to 0.31.4.0 where the blacklist note parameter in UserController::ajax_blackList_post() is stored without sanitization and rendered into an HTML data-note attribute without escaping. This allows an admin with blacklist privileges to inject arbitrary JavaScript that executes in the browsers of other admins viewing the user management page. The vulnerability has a medium severity with a CVSS score of 4.8 and is fixed in version 0.31.4.