libops captcha-protect up to 1.12.1 Destination cross site scripting

Summaryinfo

A vulnerability was found in libops captcha-protect up to 1.12.1. It has been rated as problematic. This issue affects some unknown processing of the component Destination Handler. Performing a manipulation results in cross site scripting. This vulnerability is identified as CVE-2026-34206. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in libops captcha-protect up to 1.12.1. This affects an unknown function of the component Destination Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is:

Captcha Protect is a Traefik middleware to add an anti-bot challenge to individual IPs in a subnet when traffic spikes are detected from that subnet. Prior to version 1.12.2, a reflected cross-site scripting (XSS) vulnerability exists in github.com/libops/captcha-protect. The challenge page accepted a client-supplied destination value and rendered it into HTML using Go's text/template. Because text/template does not perform contextual HTML escaping, an attacker could supply a crafted destination value that breaks out of the hidden input attribute and injects arbitrary script into the challenge page. This issue has been patched in version 1.12.2.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-34206 since 03/26/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 1.12.2 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch eef6211ecd1147273be484d913b81c68c0bd8d3f is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• libops

Name

• captcha-protect

Version

• 1.12.0
• 1.12.1

License

• open-source

Website

• Product: https://github.com/libops/captcha-protect/

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

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• 🔒

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