PT-2026-57292 · Logto Io · Logto

Published 2026-07-10 · Updated 2026-07-10 · CVE-2026-55789

Mitre

CVSS v3.1

8.5

High

Base vector

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

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.

Fix

Weakness Enumeration

CWE-1395

CWE-91

Related Identifiers

CVE-2026-55789

Affected Products

Logto

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-55789 · Security Note
• https://github.com/logto-io/logto/releases/tag/v1.41.0 · Note
• https://github.com/logto-io/logto/security/advisories/GHSA-vfpw-vq44-4p63 · Note
• https://github.com/logto-io/logto/pull/9107 · Note
• https://github.com/logto-io/logto/commit/9097054860f0d638d90778d3dcde2ba050b844b6 · Note