Medium

CI4MS: Stored XSS in Blog Content via Broken `html_purify` Validation Rule

Type: advisorySources: OSV

CI4MS is a CodeIgniter 4-based content management system skeleton. Prior to version 0.31.9.0, the custom `html_purify` validation rule used to sanitize blog post bodies relies on by-reference mutation (`?string &$str`), but CodeIgniter 4's validator passes a local copy of the value, so the sanitized text is silently discarded. The Blog controller writes `$lanData['content']` directly into `blog_langs.content`, and the public template echoes it without escaping — yielding stored XSS executable in any visitor's browser, including the superadmin when previewing or editing posts. Version 0.31.9.0 patches the issue.

Products: Not specified
Affected versions: Not specified
Fixed versions: Not specified
CVEs: CVE-2026-45138
Confirmed fixed CVEs: Not specified
Updated in this feed: 7 Nov 2026, 03:16 UTC · Revision 1

Source evidence

CI4MS: Stored XSS in Blog Content via Broken `html_purify` Validation Rule

core-osv · Original source

Published 19 Jul 2026, 23:18 UTC

osv:CVE-2026-45138

Complete source record

{
  "id": "86b19687d73b31983055856f95cfaff794a21bcd55725a6549ad1c8dbd5fe79d",
  "url": "https://osv.dev/vulnerability/CVE-2026-45138",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CI4MS: Stored XSS in Blog Content via Broken `html_purify` Validation Rule",
    "summary": "CI4MS is a CodeIgniter 4-based content management system skeleton. Prior to version 0.31.9.0, the custom `html_purify` validation rule used to sanitize blog post bodies relies on by-reference mutation (`?string &$str`), but CodeIgniter 4's validator passes a local copy of the value, so the sanitized text is silently discarded. The Blog controller writes `$lanData['content']` directly into `blog_langs.content`, and the public template echoes it without escaping — yielding stored XSS executable in any visitor's browser, including the superadmin when previewing or editing posts. Version 0.31.9.0 patches the issue.",
    "evidence": "osv:CVE-2026-45138",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-45138",
      "aliases": [
        "CVE-2026-45138",
        "GHSA-2m69-jmvh-6chr"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/ci4-cms-erp/ci4ms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "e1aad282cf9ae5395bdce7c7f75f8a9803cee75b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.31.9.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "e1aad282cf9ae5395bdce7c7f75f8a9803cee75b"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "0.31.9.0"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.31.9.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.31.8.0",
            "0.31.7.0",
            "0.31.6.0",
            "0.31.5.0",
            "0.31.4.0",
            "0.31.3.0",
            "0.31.2.0",
            "0.31.1.0",
            "0.31.0.0",
            "0.28.6.0",
            "0.28.5.0",
            "0.28.4.0",
            "0.28.3.0",
            "0.28.0.0",
            "0.27.0.0",
            "0.26.3.4",
            "0.26.3.3",
            "0.26.3.2",
            "0.26.3.1",
            "0.26.3.0",
            "0.26.2.0",
            "0.26.1.0",
            "0.26.0.0",
            "0.25.3.0",
            "0.25.2.0",
            "0.25.1.0",
            "0.25.0.43",
            "0.25.0.39",
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            "0.25.0.2",
            "0.25.0.1",
            "0.25.0.0",
            "0.24.0.60",
            "0.24.0.45",
            "0.24.0.42",
            "0.24.0.27",
            "0.24.0.20",
            "0.24.0.19",
            "0.24.0.18",
            "0.24.0.16",
            "0.24.0.0",
            "0.23.1.0",
            "0.23.0.0",
            "0.21.3.7",
            "0.21.3.6",
            "0.21.3.5",
            "0.21.3.4",
            "0.21.3.3",
            "0.21.3.2",
            "0.21.3.1",
            "0.21.3",
            "0.21.2",
            "0.21.1",
            "0.21.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45138.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.315079239Z",
      "provider": "osv",
      "references": [
        "https://github.com/ci4-cms-erp/ci4ms/releases/tag/0.31.9.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45138.json",
        "https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-2m69-jmvh-6chr",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-45138"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45138.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-45138",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517680,
  "published_at": "2026-07-19T23:18:51.312+00:00"
}