CVE-2026-34206

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.

Weakness classification

• security-advisories@github.com: CWE-79

Primary references

• security-advisories@github.com — Patch
• security-advisories@github.com — Product, Release Notes
• security-advisories@github.com — Mitigation, Patch, Vendor Advisory