CVE-2026-34565Public exploitNetwork attack vector

Account takeover via stored menu post XSS

Published Apr 1, 2026 · Updated Apr 1, 2026

Stored XSS in CI4MS Menu Management before 0.31.0.0 allows remote authenticated users to take over accounts through crafted post data. The Posts workflow stores user-controlled menu data and renders it without output encoding in administrative dashboards and public navigation menus. Low-privileged access is required to plant a payload, which executes in another user's browser when a vulnerable menu view loads.

CVSS severity9.1
Critical
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in CI4MS Menu Management before 0.31.0.0 allows remote authenticated users to take over accounts through crafted post data. The Posts workflow stores user-controlled menu data and renders it without output encoding in administrative dashboards and public navigation menus. Low-privileged access is required to plant a payload, which executes in another user's browser when a vulnerable menu view loads.

The record

CVE
CVE-2026-34565
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

  1. Apr 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 0.31.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Ci4MS · CI4MSversion=< 0.31.0.0

Published CVSS scores

9.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L
9.0NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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