CVE-2026-34571

CRITICALNVD 9.99.9—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.9 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 78% 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
9.9
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.9Exploit: 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, a Stored Cross-Site Scripting (Stored XSS) vulnerability exists in the backend user management functionality. The application fails to properly sanitize user-controlled input before rendering it in the administrative interface, allowing attackers to inject persistent JavaScript code. This results in automatic execution whenever backend users access the affected page, enabling session hijacking, privilege escalation, and full administrative account compromise. This issue has been patched in version 0.31.0.0.

CVSS v3
9.9
EG Score
9.9(medium)
EPSS
31.4%
KEV
Not listed

Published

April 1, 2026

Last Modified

April 6, 2026

Advisory Details (2)

Auto-updated Jul 5, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github.
github Patch Available🟡 PoC Available

Stored Cross‑Site Scripting (Stored XSS) in Backend User Management Allows Session Hijacking and Full Administrative Account Compromise · Advisory · ci4-cms-erp/ci4ms · GitHub

https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-fc4p-p49v-r948
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 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 8× in last 7d / 41× 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 109 total refreshes for this CVE.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:15 UTCEPSS rescore
  4. 2026-07-07 13:46 UTCEPSS rescore
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  1. 2026-06-22 14:25 UTCEPSS rescore
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  16. 2026-06-12 06:18 UTCEG score recompute
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  19. 2026-06-11 14:00 UTCEPSS rescore
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  21. 2026-06-10 21:52 UTCEG score recompute
  22. 2026-06-10 17:54 UTCEG score recompute
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  24. 2026-06-10 13:22 UTCEPSS rescore
  25. 2026-06-10 09:18 UTCEG score recompute
  26. 2026-06-10 05:22 UTCEG score recompute
  27. 2026-06-10 01:23 UTCEG score recompute
  28. 2026-06-09 18:46 UTCEG score recompute
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  30. 2026-06-08 14:17 UTCEPSS rescore
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  32. 2026-06-08 12:43 UTCEG score recompute
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  37. 2026-06-07 15:25 UTCEPSS rescore
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  40. 2026-06-07 15:10 UTCEG score recompute
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  42. 2026-06-06 13:47 UTCEPSS rescore
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  44. 2026-06-05 22:47 UTCEPSS rescore
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  67. 2026-05-26 13:44 UTCEPSS rescore
  68. 2026-05-26 07:18 UTCEPSS rescore
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  70. 2026-05-23 00:08 UTCEG score recompute
  71. 2026-05-20 22:38 UTCEPSS rescore
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  73. 2026-05-20 11:22 UTCEPSS rescore
  74. 2026-05-20 11:22 UTCEPSS rescore
  75. 2026-05-20 10:18 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-34571?
CVE-2026-34571 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, a Stored Cross-Site Scripting (Stored XSS) vulnerability exists in the backend user management functionality. The application…
When was CVE-2026-34571 disclosed?
CVE-2026-34571 was first published in the National Vulnerability Database on April 1, 2026, with the most recent update on April 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34571 actively exploited?
CVE-2026-34571 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 31.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-34571?
CVE-2026-34571 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-34571?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34571, 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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