CVE-2026-34564

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 94% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to version 0.31.0.0, the application fails to properly sanitize user-controlled input when adding Pages to navigation menus through the Menu Management functionality. Page-related data selected via the Pages section is stored server-side and rendered without proper output encoding. This stored payload is later rendered unsafely within administrative interfaces and public-facing navigation menus, leading to stored DOM-based cross-site scripting (XSS). This issue has been patched in version 0.31.0.0.

CVSS v3
9.1
EG Score
9.1(medium)
EPSS
22.5%
KEV
Not listed

Published

April 1, 2026

Last Modified

April 7, 2026

Advisory Details (2)

Auto-updated May 20, 2026
Patch available. Sources: github.
github Patch Available

Menu Management (Pages) Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS · Advisory · ci4-cms-erp/ci4ms · GitHub

https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-g4pp-fhgf-8653
generic

Release v0.31.0.0 - Major Security & Framework Update (CI 4.7.1 & Shield Integration) · ci4-cms-erp/ci4ms · GitHub

https://github.com/ci4-cms-erp/ci4ms/releases/tag/0.31.0.0

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
ci4-cms-erp/ci4ms0.21.0 ... 0.28.6.0 (47 versions)0.31.0.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-07 13:46 UTCEPSS rescore
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  1. 2026-06-21 14:56 UTCEPSS rescore
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  15. 2026-06-12 06:18 UTCEG score recompute
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  20. 2026-06-10 21:45 UTCEG score recompute
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  24. 2026-06-10 09:16 UTCEG score recompute
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  27. 2026-06-09 18:44 UTCEG score recompute
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  29. 2026-06-08 14:17 UTCEPSS rescore
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  36. 2026-06-07 15:25 UTCEPSS rescore
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  39. 2026-06-07 15:08 UTCEG score recompute
  40. 2026-06-07 11:14 UTCEG score recompute
  41. 2026-06-06 13:47 UTCEPSS rescore
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  73. 2026-05-20 11:22 UTCEPSS rescore
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-34564?
CVE-2026-34564 is a critical vulnerability published on April 1, 2026. CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to version 0.31.0.0, the application fails to properly sanitize user-controlled input when adding Pages to navigation menus through the Menu Management…
When was CVE-2026-34564 disclosed?
CVE-2026-34564 was first published in the National Vulnerability Database on April 1, 2026, with the most recent update on April 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34564 actively exploited?
CVE-2026-34564 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 22.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-34564?
CVE-2026-34564 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-34564?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34564, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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