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CriticalPublic exploit

Stored DOM XSS in CI4MS Menu Management

IdentifiersCVE-2026-34564CWE-79· Improper Neutralization of Input…

CVE-2026-34564 is a stored DOM-based cross-site scripting vulnerability in CI4MS, a CodeIgniter 4-based CMS skeleton. In versions prior to 0.31.0.0, the Menu Management functionality does not properly sanitize user-controlled page-related input when Pages are added to navigation menus. The selected page data is stored server-side and later rendered without proper output encoding in both administrative interfaces and public-facing navigation menus. As a result, attacker-controlled script content can be persisted and executed in a victim's browser when the affected menu content is viewed.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows execution of attacker-controlled JavaScript in the browser context of users who load the affected administrative interface or public-facing navigation menu. Depending on the victim context, this can enable session theft, unauthorized actions performed as the victim, content manipulation, credential capture, and access to sensitive data exposed to the browser. Because the vulnerable content is rendered in both admin and public contexts, impact can extend from compromise of lower-privileged user sessions to administrative session compromise.

Mitigation

If you can’t patch tonight, do this now.

If immediate upgrade is not possible, restrict access to Menu Management to trusted administrators only, review and remove malicious or suspicious page/menu entries, and apply strict output encoding to all menu-rendered page fields in both admin and public templates. Deploy a restrictive Content Security Policy where feasible to reduce script execution impact, although CSP should be treated as a defense-in-depth measure rather than a complete fix.

Remediation

Patch, then assume compromise.

Upgrade CI4MS to version 0.31.0.0 or later, which patches the vulnerability. Ensure that all page-related data used by Menu Management is validated and sanitized on input and, critically, context-appropriately output encoded at every rendering sink in administrative views and public navigation templates.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
Ci4-Cms-ErpCi4msapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

7 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity6

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-34564
NVD
nvd.nist.gov/vuln/detail/CVE-2026-34564
MITRE CWE · CWE-79
Improper Neutralization of Input During Web…
Vendor Advisory
github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-g4pp-fhgf-8653
Release Notes
github.com/ci4-cms-erp/ci4ms/releases/tag/0.31.0.0