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CVE-2026-79988

Status: DeferredHigh (8.7)—

The Twig sandbox mechanism in Craft CMS is configured to allow dangerous functionality from the Yii framework, leading to authenticated RCE similar to previously disclosed vulnerabilities.

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).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

Acceso remoto autenticado (PR:L, UI:N) sin requisito de interacción. Sandbox Twig eludido permite RCE mediante funcionalidad peligrosa de Yii framework; T1210 por ser servicio remoto que requiere autenticación previa.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Privileged Account ManagementDisable or Remove Feature or ProgramApplication Developer GuidanceActive Directory ConfigurationVulnerability ScanningUser Training

Affected technologies (2)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Craftcms — Craft CMSAIYII — YIIAI

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2026-79988",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-79988",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-08-28T03:55:36.964723Z"
        }
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "7004884b-51e2-48e8-b4a2-5ca29e80453e",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 8.7,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "LOW",
          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "HIGH",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "7004884b-51e2-48e8-b4a2-5ca29e80453e",
      "affectedData": [
        {
          "vendor": "craftcms",
          "product": "cms",
          "versions": [
            {
              "status": "affected",
              "version": "4.0.0-RC1",
              "lessThan": "4.18.3",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "5.0.0-RC1",
              "lessThan": "5.10.7",
              "versionType": "semver"
            }
          ],
          "packageName": "craftcms/cms",
          "collectionURL": "https://packagist.org",
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-08-27T17:20:49.540",
  "references": [
    {
      "url": "https://github.com/craftcms/cms",
      "source": "7004884b-51e2-48e8-b4a2-5ca29e80453e"
    },
    {
      "url": "https://github.com/craftcms/cms/releases/tag/5.10.7",
      "source": "7004884b-51e2-48e8-b4a2-5ca29e80453e"
    },
    {
      "url": "https://www.hckrt.com/hacktivity/HCKRT-8RQQ7K",
      "source": "7004884b-51e2-48e8-b4a2-5ca29e80453e"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "7004884b-51e2-48e8-b4a2-5ca29e80453e",
      "description": [
        {
          "lang": "en",
          "value": "CWE-693"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Twig sandbox mechanism in Craft CMS is configured to allow dangerous functionality from the Yii framework, leading to authenticated RCE similar to previously disclosed vulnerabilities."
    }
  ],
  "lastModified": "2026-08-28T20:20:08.133",
  "sourceIdentifier": "7004884b-51e2-48e8-b4a2-5ca29e80453e"
}