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CriticalPublic exploit

Stored XSS in CI4MS group and role management

IdentifiersCVE-2026-34557CWE-79· Improper Neutralization of Input…

CVE-2026-34557 is a stored cross-site scripting vulnerability in CI4MS, a CodeIgniter 4-based CMS skeleton, affecting versions prior to 0.31.0.0. The issue stems from improper sanitization and unsafe rendering of user-controlled input in the group and role management functionality. According to the provided content, three distinct group-related input fields can accept malicious JavaScript payloads, which are stored server-side and later rendered in privileged administrative views without proper output encoding. This results in stored XSS within the role and permission management context.

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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 an attacker to persist malicious JavaScript in CI4MS and have it executed in the browser of a privileged administrator viewing the affected role or permission management interfaces. This can enable session theft, execution of unauthorized actions in the administrator's context, access to sensitive administrative data exposed to the browser, and potential compromise of administrative workflows. The provided CVSS vector indicates scope change and high confidentiality impact, with low integrity and availability impact.

Mitigation

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

If immediate upgrade is not possible, restrict access to group and role management functionality to the smallest possible set of trusted users, review and remove suspicious content from existing group-related fields, and implement or verify server-side and template-level output encoding for any user-supplied data rendered in administrative interfaces. Additional browser-side controls such as a restrictive Content Security Policy may reduce exploitability, but do not replace fixing the underlying stored XSS condition.

Remediation

Patch, then assume compromise.

Upgrade CI4MS to version 0.31.0.0 or later, as the issue is patched in version 0.31.0.0. Ensure that all user-controlled fields in group and role management are properly validated and sanitized on input, and that stored values are context-appropriately output encoded before rendering in administrative views.
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

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

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

The version that knows your environment.

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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 activity5

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-34557
NVD
nvd.nist.gov/vuln/detail/CVE-2026-34557
MITRE CWE · CWE-79
Improper Neutralization of Input During Web…
Vendor Advisory
github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-rpjr-985c-qhvm