Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Libops | Captcha Protect | < 1.12.2 |
Related Weaknesses (CWE)
References
- https://github.com/libops/captcha-protect/commit/eef6211ecd1147273be484d913b81c6Patch
- https://github.com/libops/captcha-protect/releases/tag/v1.12.2ProductRelease Notes
- https://github.com/libops/captcha-protect/security/advisories/GHSA-ph62-4j5g-2q4MitigationPatchVendor Advisory
FAQ
What is CVE-2026-34206?
CVE-2026-34206 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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 sc...
How severe is CVE-2026-34206?
CVE-2026-34206 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34206?
Check the references section above for vendor advisories and patch information. Affected products include: Libops Captcha Protect.