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CVE-2023-44766

Status: ModifiedMedium (4.8)—💥 PoC

A Cross Site Scripting (XSS) vulnerability in Concrete CMS v.9.2.1 allows an attacker to execute arbitrary code via a crafted script to the SEO - Extra from Page Settings. NOTE: the vendor disputes this because this SEO-related header change can only be made by an admin, and allowing an admin to place JavaScript there is an intentional customization feature.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

💥 Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

⚠️ GitHub proofs of concept are not verified: some are fake or contain malware. Never run them outside an isolated lab.

Affected technologies (1)

Concretecms — Concrete CMS

CWEs

References

Raw JSON (NVD)

Show
{
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  "metrics": {
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      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 4.8,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
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  ],
  "published": "2023-10-06T13:15:12.977",
  "references": [
    {
      "url": "https://github.com/sromanhu/ConcreteCMS-Stored-XSS---SEO",
      "tags": [
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    },
    {
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      "tags": [
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    },
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  "vulnStatus": "Modified",
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  "descriptions": [
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      "value": "A Cross Site Scripting (XSS) vulnerability in Concrete CMS v.9.2.1 allows an attacker to execute arbitrary code via a crafted script to the SEO - Extra from Page Settings. NOTE: the vendor disputes this because this SEO-related header change can only be made by an admin, and allowing an admin to place JavaScript there is an intentional customization feature."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de Cross Site Scripting (XSS) en Concrete CMS v.9.2.1 permite a un atacante ejecutar código arbitrario a través de un script manipulado para SEO - Extra desde Configuración de página."
    }
  ],
  "lastModified": "2026-06-17T06:27:47.330",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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