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CVE-2021-43558

Status: ModifiedMedium (6.1)—

A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A URL parameter in the filetype site administrator tool required extra sanitizing to prevent a reflected XSS risk.

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).

Affected technologies (3)

Fedoraproject — Extra Packages FOR Enterprise LinuxFedoraproject — FedoraMoodle — Moodle

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2021-43558",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
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          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
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        "obtainOtherPrivilege": false,
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    "cvssMetricV31": [
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          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
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  "affected": [
    {
      "source": "patrick@puiterwijk.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "moodle",
          "versions": [
            {
              "status": "affected",
              "version": "moodle 3.11.4, moodle 3.10.8 and moodle 3.9.11"
            }
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  "published": "2021-11-22T16:15:08.237",
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      "tags": [
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        "Third Party Advisory"
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      "source": "patrick@puiterwijk.org"
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  "vulnStatus": "Modified",
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      "source": "patrick@puiterwijk.org",
      "description": [
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          "lang": "en",
          "value": "CWE-79"
        }
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      "source": "nvd@nist.gov",
      "description": [
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          "value": "CWE-79"
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      "lang": "en",
      "value": "A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A URL parameter in the filetype site administrator tool required extra sanitizing to prevent a reflected XSS risk."
    },
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      "lang": "es",
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    }
  ],
  "lastModified": "2026-06-17T04:11:08.023",
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