Captcha Protect: Reflected XSS in challenge page via unsanitized destination rendered with text/template_CVE-2026-34206

{
    "lastseen": "",
    "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.",
    "published": "2026-03-31T19:34:21.383Z",
    "modified": "2026-04-01T18:41:05.256Z",
    "type": "cve",
    "title": "Captcha Protect: Reflected XSS in challenge page via unsanitized destination rendered with text/template",
    "source": "GitHub_M",
    "references": "https://github.com/libops/captcha-protect/security/advisories/GHSA-ph62-4j5g-2q4r\nhttps://github.com/libops/captcha-protect/commit/eef6211ecd1147273be484d913b81c68c0bd8d3f\nhttps://github.com/libops/captcha-protect/releases/tag/v1.12.2",
    "id": "CVE-2026-34206",
    "bulletinFamily": "",
    "cwe": [
        "CWE-79"
    ],
    "cvelist": null,
    "sourceData": "libops captcha-protect < 1.12.2",
    "sourceHref": "",
    "cvss": {
        "score": 6.1,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "captcha-protect",
    "version": "< 1.12.2",
    "vendor": "libops",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}