CVE-2026-34563Public exploitNetwork attack vector

Account takeover via unencoded backup filename

Published Apr 1, 2026 · Updated Apr 1, 2026

Stored cross-site scripting in CI4MS before 0.31.0.0 allows remote authenticated users to execute JavaScript through backup metadata. The backup workflow accepts a filename inserted by an uploaded SQL file and later renders that value in backup-management views without output encoding. Any authenticated role able to reach the backup workflow can plant code that runs in another user's browser, enabling account takeover or privilege escalation.

CVSS severity9.9
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 cross-site scripting in CI4MS before 0.31.0.0 allows remote authenticated users to execute JavaScript through backup metadata. The backup workflow accepts a filename inserted by an uploaded SQL file and later renders that value in backup-management views without output encoding. Any authenticated role able to reach the backup workflow can plant code that runs in another user's browser, enabling account takeover or privilege escalation.

The record

CVE
CVE-2026-34563
Published
Apr 1, 2026
Updated
Apr 1, 2026
Vendor
Ci4MS
Product
CI4MS
Classifications
CWE-79, T1059.007
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

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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=< 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

9.0NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
9.9GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
9.1GitHub, Inc. CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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