s2Member <= 261011 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'date_format' Shortcode Attribute

{
  "id": "d2d6f2c6a23e53f9d721df60c5ce747e2fe74f5e04a9e1522e2be531e3f0342f",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-109972",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "s2Member <= 261011 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'date_format' Shortcode Attribute",
    "summary": "The s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'date_format' parameter in all versions up to, and including, <= 261011 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The payload bypasses wp_kses_post() on save because it contains no literal angle brackets — only backslash-escaped sequences that PHP's date() materializes into HTML tag characters at render time after WordPress's shortcode_parse_atts() applies stripcslashes() to the attribute value.",
    "evidence": "cve:CVE-2026-109972",
    "products": [
      {
        "name": {
          "value": "s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-109972",
      "aliases": [
        "CVE-2026-109972"
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "version": "3.1",
            "baseScore": 6.4,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N"
          }
        }
      ],
      "affected": [
        {
          "vendor": "clavaque",
          "product": "s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "versionType": "semver",
              "lessThanOrEqual": "261011"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ],
      "modified": "2026-10-28T16:10:21.905Z",
      "provider": "cve",
      "references": [
        "https://www.wordfence.com/threat-intel/vulnerabilities/id/2782f0f7-625d-4141-8e2c-4bdaa0219007?source=cve",
        "https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/sc-gets-in.inc.php#L119",
        "https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/sc-gets-in.inc.php#L98",
        "https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/sc-gets-in.inc.php#L53",
        "https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/codes.inc.php#L24",
        "https://plugins.trac.wordpress.org/changeset/3751344/s2member/trunk/src/includes/classes/sc-gets-in.inc.php"
      ],
      "provider_metadata": {
        "adp": [
          {
            "title": "CISA ADP Vulnrichment",
            "metrics": [
              {
                "other": {
                  "type": "ssvc",
                  "content": {
                    "id": "CVE-2026-109972",
                    "role": "CISA Coordinator",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "version": "2.0.3",
                    "timestamp": "2026-10-28T14:36:07.974395Z"
                  }
                }
              }
            ],
            "providerMetadata": {
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP",
              "dateUpdated": "2026-10-28T16:10:21.905Z"
            }
          }
        ],
        "cna": {
          "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
          "shortName": "Wordfence",
          "dateUpdated": "2026-10-28T06:45:08.551Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-109972",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 460265,
  "published_at": "2026-10-28T06:45:08.551+00:00"
}