CVE-2026-34564

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 77% 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
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 9.1Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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
9.1CRITICALmedium confidence
EG Risk
57
EG Risk 57/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation40% × 40%
Automatability0% × 15%
EPSS PROB
0.4%
EPSS %ILE
31st
KEV
Not listed

Published

April 1, 2026

Last Modified

April 7, 2026

Advisory Details (2)

Auto-updated Aug 1, 2026
Patch available. Sources: github_release, github.
githubMentions a patch (unverified)

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
github_release Patch Available

v0.31.0.0 - Major Security & Framework Update (CI 4.7.1 & Shield Integration)

Patch available: ci4-cms-erp/ci4ms 0.31.0.0 (pre-release)

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

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
ci4-cms-erp/ci4ms0.21.0 ... 0.28.6.0 (47 versions)
  • every version up to 0.31.0.0: fixed in 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 / 24× 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.

Showing the most recent 100 of 179 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:12 UTCEPSS rescore
  3. 2026-10-07 23:47 UTCEPSS rescore
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  13. 2026-09-21 14:19 UTCOSV refresh
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  1. 2026-09-08 22:00 UTCEPSS rescore
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  6. 2026-09-02 11:44 UTCOSV refresh
  7. 2026-09-01 13:53 UTCEPSS rescore
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  23. 2026-08-16 09:28 UTCEG score recompute
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  39. 2026-08-06 13:46 UTCEPSS rescore
  40. 2026-08-06 00:27 UTCEG score recompute
  41. 2026-08-05 19:17 UTCEPSS rescore
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  44. 2026-08-03 22:48 UTCEG score recompute
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  47. 2026-08-02 02:27 UTCEPSS rescore
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  66. 2026-07-17 19:59 UTCOSV refresh
  67. 2026-07-16 17:03 UTCEPSS rescore
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  74. 2026-07-12 05:46 UTCEPSS rescore
  75. 2026-07-11 08:27 UTCEPSS rescore

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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 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 0.4% probability of exploitation in the next 30 days (31st percentile of EPSS-scored CVEs).
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?
A fix for CVE-2026-34564 is available: update to the fixed version the vendor names in its advisory.

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