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CVE-2026-55789

HIGH
8.5
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-55789
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-17 14:40 UTC
Published
2026-07-10 19:55 UTC
Last updated
2026-07-10 19:55 UTC
Primary CWE
CWE-91
CWE-91: XML Injection (aka Blind XPath Injection)
Vendor / Product
logto-io / logto
Sources
cve.org  ·  NVD

Severity & Metrics

8.5 HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N
Affected products (1)
VendorProductPlatformVersions
logto-io logto — < 1.41.0
Weakness (CWE)
CWESourceDescription
CWE-1395 cna CWE-1395: Dependency on Vulnerable Third-Party Component
CWE-91 cna CWE-91: XML Injection (aka Blind XPath Injection)
CVSS scores (1)
ScoreSeverityVersionSourceVector
8.5 HIGH 3.1 cna CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N
References (4)
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