CI4MS is a CodeIgniter 4-based content management system skeleton. Prior to version 0.31.9.0, the Pages backend module registers the html_purify validation rule on language-keyed page content but persists the raw, un-purified POST value into the database. The public renderer for pages (Home::index() → app/Views/templates/default/pages.php) emits $pageInfo->content without esc(), yielding stored XSS that fires for every public visitor of the affected page — including administrators. Because pages may be promoted to the site home page, the payload can be served at / and reach every visitor of the site. Version 0.31.9.0 patches the issue.
CVE-2026-45270
HIGHPre-NVD 8.78.7—Elevated
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 89% 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, secondary
8.7
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.7Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 8.7
- EG Score
- 8.7(medium)
- EG Risk
- 55(Track)EG Risk 55/100SSVC: Track
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 computedSeverity87% × 45%Exploitation40% × 40%Automatability0% × 15%Action: Routine — remediate on your standard cadence. - EPSS
- 10.9%
- KEV
- Not listed
Published
May 18, 2026
Last Modified
July 21, 2026
Advisory Details (2)
Auto-updated Jul 20, 2026🔬 Proof of concept available. Patch available. Sources: github_release, github.
github Patch Available🟡 PoC Available
Stored XSS in Pages Module Content via Broken html_purify Validation Rule · Advisory · ci4-cms-erp/ci4ms · GitHub
https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-gqr2-7hcg-rchfgithub_release Patch Available
v0.31.9.0 — Security Hardening & Patch Release
Patch available: ci4-cms-erp/ci4ms 0.31.9.0
https://github.com/ci4-cms-erp/ci4ms/releases/tag/0.31.9.0Vendor Advisories for CVE-2026-45270(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(1 across 1 ecosystem)
Packagist(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| ci4-cms-erp/ci4ms | 0.21.0 ... 0.31.9 (57 versions) | 0.31.9.0 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 3× in last 7d / 3× 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.
- 2026-07-23 03:16 UTCEG score recompute
- 2026-07-22 14:08 UTCEPSS rescore
- 2026-07-21 15:24 UTCEPSS rescore
- 2026-06-14 23:18 UTCEPSS rescore
- 2026-06-13 23:00 UTCEPSS rescore
- 2026-06-12 23:12 UTCEPSS rescore
- 2026-05-24 06:17 UTCEG score recompute
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-45270?
CVE-2026-45270 is a high vulnerability published on May 18, 2026. CI4MS is a CodeIgniter 4-based content management system skeleton. Prior to version 0.31.9.0, the Pages backend module registers the html_purify validation rule on language-keyed page content but persists the raw, un-purified POST value into the database. The public renderer for pages…
When was CVE-2026-45270 disclosed?
CVE-2026-45270 was first published in the National Vulnerability Database on May 18, 2026, with the most recent update on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45270 actively exploited?
CVE-2026-45270 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45270?
CVE-2026-45270 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-45270?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45270, 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.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-45270
Is Your Infrastructure Affected by CVE-2026-45270?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.