EUVD-2026-65346
GHSA-j8g2-q9pf-89w3
Severity by source
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
Network-accessible TYPO3 backend (AV:N), low-privilege backend editor required (PR:L), scope changes as Fluid/TypoScript execution escapes the extension boundary (S:C), availability impact rated low as DoS is not the primary described impact.
Primary rating from Vendor (TYPO3).
CVSS VectorVendor: TYPO3
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
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Server-Side Template Injection in TYPO3's Event Management and Registration extension allows authenticated backend editors to disclose sensitive application data or execute TypoScript content objects by supplying Fluid ViewHelper syntax in the email subject field. The flaw affects backend users with edit access to the event registration plugin or backend module - an insider-level privilege boundary that limits but does not eliminate risk, particularly in multi-tenant or agency-managed TYPO3 installations. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid TYPO3 backend account with edit access specifically to the event registration plugin or backend module - this is the explicit prerequisite stated in the CVE description. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H) signals high potential impact but with two meaningful dampeners: AT:P (attack precondition - authenticated backend access with specific plugin edit rights) and PR:L (low privilege, but still requires a valid TYPO3 backend account). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A backend editor account - legitimately provisioned or compromised via credential theft - logs into the TYPO3 backend and navigates to the event registration plugin configuration. The attacker enters a crafted Fluid ViewHelper expression (e.g., referencing internal object properties or invoking a TypoScript content object) into the email subject field. … |
| Remediation | Apply the patched version of the Event Management and Registration extension as specified in the TYPO3 security advisory at https://typo3.org/security/advisory/typo3-ext-sa-2026-023 - the exact fixed version should be confirmed there. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all TYPO3 instances running the Event Management and Registration extension; identify and audit all backend users with edit permissions to event registration modules; enable and review backend access logs for suspicious activity. …
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