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Vulnerability record · CVE-2026-55789 · published 10 July 2026

CVE-2026-55789: XML injection vulnerability

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.

8.5 CVSS 3.1 High EPSS 0.40% · top 68.2% CWE-91 · XML injection Deferred
8.5CVSS 3.1 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
13 Jul 2026Last modified by NVD

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.

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

References

LinkTags
https://github.com/logto-io/logto/commit/9097054860f0d638d90778d3dcde2ba050b844b6
https://github.com/logto-io/logto/pull/9107
https://github.com/logto-io/logto/releases/tag/v1.41.0
https://github.com/logto-io/logto/security/advisories/GHSA-vfpw-vq44-4p63
https://github.com/logto-io/logto/security/advisories/GHSA-vfpw-vq44-4p63

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Source: NIST National Vulnerability Database (record CVE-2026-55789), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.