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CVE-2026-54714— Logto: XSS via unescaped RelayState in SAML auto-submit form

Quick assessment

Affected
logto-io logto
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.

logto-io logto是logto-io组织的一个身份认证和用户管理平台。 logto-io logto 1.41.0之前版本存在跨站脚本漏洞，该漏洞源于对SAML RelayState、SAMLResponse和actionUrl的HTML属性未进行转义处理，攻击者通过特制的RelayState注入脚本，在用户完成登录后执行跨站脚本攻击。

CVSS 6.1 · Medium EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
logto-io logto < 1.41.0 affected
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I. Basic Information for CVE-2026-54714

Vulnerability Information
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Vulnerability Title
Logto: XSS via unescaped RelayState in SAML auto-submit form
Source: CVE Program / CVE List V5
Vulnerability Description
Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, @logto/core reflected the SAML RelayState, SAMLResponse, and actionUrl into a Logto-origin auto-submit HTML form in packages/core/src/saml-application/SamlApplication/utils.ts without HTML-attribute escaping. A SAML application flow with a crafted RelayState from GET or POST /api/saml/:id/authn could inject script that runs on the Logto tenant origin after the user completes login. This issue is fixed in version 1.41.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
logto-io logto 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
logto-io logto是logto-io组织的一个身份认证和用户管理平台。 logto-io logto 1.41.0之前版本存在跨站脚本漏洞，该漏洞源于对SAML RelayState、SAMLResponse和actionUrl的HTML属性未进行转义处理，攻击者通过特制的RelayState注入脚本，在用户完成登录后执行跨站脚本攻击。
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
logto-io logto < 1.41.0 -

II. Public POCs for CVE-2026-54714

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III. Intelligence Information for CVE-2026-54714

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Patches & Fixes for CVE-2026-54714 (2)

Vendor Pages for CVE-2026-54714 (1)

Other References for CVE-2026-54714 (1)

Same Patch Batch · logto-io · 2026-07-10 · 4 CVEs total

CVE-2026-55789 8.5 HIGH Logto: SAML IdP injects user-controlled profile attributes raw into signed assertions, all
CVE-2026-55377 8.1 HIGH Logto: Account Center MFA management step-up bypass via WebAuthn registration verification
CVE-2026-55370 6.4 MEDIUM Logto: TOTP code can be replayed within the RFC 6238 validity window (one-time use violati

IV. Related Vulnerabilities

Same product: logto
Same vendor: logto-io
Same weakness: CWE-79

V. Comments for CVE-2026-54714

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