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CVE-2026-41569— authentik: WS-Federation wreply origin bypass can exfiltrate signed login responses to attacker-controlled endpoints

Quick assessment

Affected
goauthentik authentik
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

authentik是authentik开源的一个身份提供应用程序。 authentik 2026.2.3之前版本存在输入验证错误漏洞，该漏洞源于WS-Federation提供程序使用原始字符串前缀检查而非正确URL解析验证用户提供的wreply参数，可能导致攻击者构造登录链接将受害者浏览器重定向到攻击者控制的基础设施。

AI Predicted 8.1 Difficulty: Easy EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
goauthentik authentik < 2026.2.3 affected
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I. Basic Information for CVE-2026-41569

Vulnerability Information
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Vulnerability Title
authentik: WS-Federation wreply origin bypass can exfiltrate signed login responses to attacker-controlled endpoints
Source: CVE Program / CVE List V5
Vulnerability Description
authentik is an open-source identity provider. Prior to version 2026.2.3, the WS-Federation provider validates the user-supplied wreply parameter using a raw string prefix check rather than proper URL parsing. An attacker who can craft a login link can supply a wreply value on a different origin that passes the check (e.g. https://portal.example.com.evil.tld/), causing the victim's browser to POST the signed WS-Federation login response to attacker-controlled infrastructure. This issue has been patched in version 2026.2.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
authentik 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
authentik是authentik开源的一个身份提供应用程序。 authentik 2026.2.3之前版本存在输入验证错误漏洞，该漏洞源于WS-Federation提供程序使用原始字符串前缀检查而非正确URL解析验证用户提供的wreply参数，可能导致攻击者构造登录链接将受害者浏览器重定向到攻击者控制的基础设施。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
goauthentik authentik < 2026.2.3 -

II. Public POCs for CVE-2026-41569

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III. Intelligence Information for CVE-2026-41569

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Vendor Advisories for CVE-2026-41569 (1)

Same Patch Batch · goauthentik · 2026-06-02 · 6 CVEs total

CVE-2026-49448 9.8 CRITICAL authentik: SourceStage bypass via empty POST
CVE-2026-42849 9.3 CRITICAL authentik: Reflected XSS in SFE AutosubmitStage allows IDP account takeover
CVE-2026-49443 8.8 HIGH authentik: `UserSourceConnection.user` and `GroupSourceConnection.group` are changeable th
CVE-2026-47201 8.5 HIGH authentik: XML Signature Wrapping in SAML Source ACS allows authentication as arbitrary fe
CVE-2026-41577 authentik: SAML source does not validate Conditions, timing, or audience on assertions

IV. Related Vulnerabilities

Same product: authentik
Same vendor: goauthentik
Same weakness: CWE-601

V. Comments for CVE-2026-41569

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