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CVE-2026-77129

Status: DeferredHigh (7.7)—

The extension passes an editor-configurable email subject string directly into a Fluid template source without restriction. A backend user with edit access to the event plugin or Backend Module can supply Fluid ViewHelper syntax in this field to disclose sensitive data or execute TypoScript content objects. Exploitation of this issue requires an authenticated backend account with edit access to the event registration plugin or backend module.

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 autenticado a servicio remoto (backend TYPO3) con PR:L permite inyectar sintaxis Fluid para ejecución de TypoScript y divulgación de datos sensibles.

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 ProgramVulnerability ScanningThreat Intelligence ProgramRestrict Web-Based ContentNetwork Segmentation

Affected technologies (2)

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

Typo3 — Event RegistrationAITypo3 — Typo3AI

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2026-77129",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-77129",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-08-25T14:07:39.224226Z"
        }
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 7.7,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/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": "PRESENT",
          "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": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
      "affectedData": [
        {
          "repo": "https://github.com/derhansen/sf_event_mgt",
          "vendor": "TYPO3",
          "product": "Extension \"Event management and registration\"",
          "versions": [
            {
              "status": "affected",
              "version": "9.0.0",
              "lessThan": "9.0.3",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "8.0.0",
              "lessThan": "8.6.2",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "7.0.0",
              "lessThan": "7.9.3",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.0.0",
              "lessThan": "6.7.2",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "0",
              "lessThan": "5.9.3",
              "versionType": "semver"
            }
          ],
          "packageName": "derhansen/sf_event_mgt",
          "collectionURL": "https://packagist.org/",
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-08-25T09:17:33.200",
  "references": [
    {
      "url": "https://typo3.org/security/advisory/typo3-ext-sa-2026-023",
      "source": "f4fb688c-4412-4426-b4b8-421ecf27b14a"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
      "description": [
        {
          "lang": "en",
          "value": "CWE-1336"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The extension passes an editor-configurable email subject string directly into a Fluid template source without restriction. A backend user with edit access to the event plugin or Backend Module can supply Fluid ViewHelper syntax in this field to disclose sensitive data or execute TypoScript content objects. Exploitation of this issue requires an authenticated backend account with edit access to the event registration plugin or backend module."
    }
  ],
  "lastModified": "2026-08-26T17:13:53.420",
  "sourceIdentifier": "f4fb688c-4412-4426-b4b8-421ecf27b14a"
}