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

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Summary

CVECVE-2026-55789
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-10 20:16:47 UTC
Updated2026-07-10 20:16:47 UTC
DescriptionLogto 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.

Risk And Classification

Primary CVSS: v3.1 8.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N

EPSS: 0.002980000 probability, percentile 0.216350000 (date 2026-07-11)

Problem Types: CWE-91 | CWE-91 CWE-91: XML Injection (aka Blind XPath Injection) | CWE-1395 CWE-1395: Dependency on Vulnerable Third-Party Component

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.5HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N
3.1CNADECLARED8.5HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Logto-io Logto affected < 1.41.0 Not specified

References

ReferenceSourceLinkTags
github.com/logto-io/logto/commit/9097054860f0d638d90778d3dcde2ba050b844b6 [email protected] github.com
github.com/logto-io/logto/pull/9107 [email protected] github.com
github.com/logto-io/logto/security/advisories/GHSA-vfpw-vq44-4p63 [email protected] github.com
github.com/logto-io/logto/releases/tag/v1.41.0 [email protected] github.com
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