CVE-2026-112237 TYPO3 CVE debrief

Who should care

Defenders responsible for systems using the affected extension should assess exposure and prioritize patching or mitigation to prevent potential security breaches. They should also monitor for suspicious activity and implement additional security controls to prevent exploitation.

Why it matters

CVE-2026-112237 is a MEDIUM-severity vulnerability in an extension that allows an unauthenticated attacker to make the server send requests to arbitrary internal or external hosts. Defenders should prioritize verifying affected systems and applying patches or mitigations to prevent exploitation.

• Verify affected systems and apply patches or mitigations to prevent exploitation
• Monitor for suspicious activity
• Implement additional security controls to prevent exploitation

Technical summary

The extension provides a public proxy endpoint that fetches a URL on behalf of the visitor. For one HTTP request method, the endpoint does not apply the authorization check that protects the other methods, so the URL it fetches is fully controlled by the requester. An unauthenticated attacker can make the server send requests to arbitrary internal or external hosts. The attacker receives the status code and selected response headers, which allows probing of internal hosts and ports. Response bodies are not disclosed.

Defensive priority

Defenders should prioritize verifying the affected systems and applying patches or mitigations to prevent exploitation.

Recommended defensive actions

• Verify the affected systems and apply patches or mitigations
• Monitor for suspicious activity
• Implement additional security controls to prevent exploitation
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The evidence for this vulnerability comes from the NVD vulnerability database and a source reference from typo3.org. The CVE record was published on 2026-10-20T10:17:04.530Z and has not been modified since then. The vulnerability allows an unauthenticated attacker to probe internal hosts and ports by receiving status codes and selected response headers.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.