authentik has a forward authentication bypass with broken cookie_CVE-2026-25748

{
    "lastseen": "",
    "description": "authentik is an open-source identity provider. Prior to 2025.10.4 and 2025.12.4, with a malformed cookie it was possible to bypass authentication when using forward authentication in the authentik Proxy Provider when used in conjunction with Traefik or Caddy as reverse proxy. When a malicious cookie was used, none of the authentik-specific X-Authentik-* headers were set which depending on application can grant access to an attacker. authentik 2025.10.4 and 2025.12.4 fix this issue.",
    "published": "2026-02-12T19:36:45.631Z",
    "modified": "2026-02-12T19:36:45.631Z",
    "type": "cve",
    "title": "authentik has a forward authentication bypass with broken cookie",
    "source": "GitHub_M",
    "references": "https://github.com/goauthentik/authentik/security/advisories/GHSA-fj56-5763-j8pp\nhttps://github.com/goauthentik/authentik/releases/tag/version%2F2025.10.4\nhttps://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.4",
    "id": "CVE-2026-25748",
    "bulletinFamily": "",
    "cwe": [
        "CWE-287"
    ],
    "cvelist": null,
    "sourceData": "goauthentik authentik >= 2025.10.0-rc1, < 2025.10.4\ngoauthentik authentik >= 2025.10.0-rc1, < 2025.12.4",
    "sourceHref": "",
    "cvss": {
        "score": 8.6,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/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": "authentik",
    "version": ">= 2025.10.0-rc1, < 2025.10.4",
    "vendor": "goauthentik",
    "ai_description": "Forward authentication bypass with broken cookie",
    "ai_severity": "High",
    "ai_vendor": "goauthentik",
    "ai_product": "authentik",
    "ai_version": "2025.10.0-rc1 to 2025.10.4, 2025.10.0-rc1 to 2025.12.4",
    "ai_score": 8.6
}