EUVD-2026-17602CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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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.
Analysis
Reflected cross-site scripting (XSS) in Captcha Protect versions prior to 1.12.2 allows unauthenticated remote attackers to inject arbitrary script into the anti-bot challenge page by supplying a crafted destination parameter. The vulnerability exploits unsafe use of Go's text/template library, which does not perform contextual HTML escaping, enabling attackers to break out of HTML attributes and execute malicious code in the context of users viewing the challenge page. …
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