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CVE-2026-55789— Logto: SAML IdP injects user-controlled profile attributes raw into signed assertions, allowing privilege escalation at relying Service Providers

Quick assessment

Affected
logto-io logto
Exploitation
Public or AI PoC available; prioritize validation
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之前版本存在输入验证错误漏洞，该漏洞源于使用samlify 2.10.0构建SAML响应时，对用户可控的个人资料属性（如名称、电子邮件和自定义属性映射值）未进行转义处理，导致经过身份验证的低权限用户可在个人资料属性中插入XML标记，从而伪造SAML属性实现权限提升。

CVSS 8.5 · High EPSS 0.40% · P32

Affected Version Matrix 1

VendorProduct Version RangeStatus
logto-io logto < 1.41.0 affected
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I. Basic Information for CVE-2026-55789

Vulnerability Information
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Vulnerability Title
Logto: SAML IdP injects user-controlled profile attributes raw into signed assertions, allowing privilege escalation at relying Service Providers
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's self-hosted SAML application IdP built the signed SAML response and assertion by string-substituting user-controlled profile attributes such as name, email, and custom attribute-mapping values into element-text placeholders of a SAML XML template using samlify 2.10.0, which left those placeholders unescaped. An authenticated low-privilege user could place XML markup in a profile attribute so Logto signed a forged SAML attribute, such as an arbitrary role, allowing privilege escalation at relying Service Providers that authorize on SAML attributes. 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:L/UI:N/S:C/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
XML注入(XPath盲注)
Source: CVE Program / CVE List V5
Vulnerability Title
logto-io logto 输入验证错误漏洞
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之前版本存在输入验证错误漏洞，该漏洞源于使用samlify 2.10.0构建SAML响应时，对用户可控的个人资料属性（如名称、电子邮件和自定义属性映射值）未进行转义处理，导致经过身份验证的低权限用户可在个人资料属性中插入XML标记，从而伪造SAML属性实现权限提升。
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-2026-55789

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8949 chars
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III. Intelligence Information for CVE-2026-55789

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Patches & Fixes for CVE-2026-55789 (1)

Vendor Pages for CVE-2026-55789 (1)

Other References for CVE-2026-55789 (1)

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

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
CVE-2026-54714 6.1 MEDIUM Logto: XSS via unescaped RelayState in SAML auto-submit form

IV. Related Vulnerabilities

Same product: logto
Same vendor: logto-io
Same weakness: CWE-91

V. Comments for CVE-2026-55789

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