CVE-2023-41100
MEDIUMCVE-2023-41100 is a medium-severity (CVSS 5.3) vulnerability in hcaptcha_for_ext\ form project. O3 Security detects and blocks CVE-2023-41100 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.
An issue was discovered in the hcaptcha (aka hCaptcha for EXT:form) extension before 2.1.2 for TYPO3. It fails to check that the required captcha field is submitted in the form data.…
Description
An issue was discovered in the hcaptcha (aka hCaptcha for EXT:form) extension before 2.1.2 for TYPO3. It fails to check that the required captcha field is submitted in the form data. allowing a remote user to bypass the CAPTCHA check.
Affected Products
form projecthcaptcha_for_ext\Detection & mitigation playbook
Vendor / applianceDetect
Inventory every hcaptcha_for_ext\ form project deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for exploitation at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.
Fix
Apply the hcaptcha_for_ext\ form project security patch or hotfix for CVE-2023-41100 on the affected version, following the vendor advisory for your exact build.
Workarounds
Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.
How O3 protects you
O3 detects and blocks CVE-2023-41100 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.
Tailored to CVE-2023-41100. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2023-41100 being exploited in your environment?
O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2023-41100 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.