PT-2026-29334 · Unknown+1 · Captcha-Protect+1

Joecorall · Published 2026-03-31 · Updated 2026-04-01 · CVE-2026-34206

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Captcha Protect versions prior to 1.12.2

Description Captcha Protect is a Traefik middleware designed to add an anti-bot challenge to individual IPs within a subnet when traffic spikes are detected. A reflected cross-site scripting (XSS) issue exists in versions prior to 1.12.2. 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 to inject arbitrary script into the challenge page. The vulnerability occurs because the application renders a client-supplied value into HTML without proper escaping.

Recommendations Update to version 1.12.2 or later.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-34206

GHSA-PH62-4J5G-2Q4R

Affected Products

Captcha-Protect

Traefik

References · 8

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34206.json · Exploit
• https://github.com/libops/captcha-protect/commit/eef6211ecd1147273be484d913b81c68c0bd8d3f · Patch
• https://github.com/libops/captcha-protect/security/advisories/GHSA-ph62-4j5g-2q4r · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-34206 · Security Note
• https://osv.dev/vulnerability/CVE-2026-34206 · Vendor Advisory
• https://github.com/libops/captcha-protect/releases/tag/v1.12.2 · Note
• https://twitter.com/CVEnew/status/2039372147798241716 · Twitter Post
• https://twitter.com/infoflowcloud/status/2039373972454715490 · Twitter Post