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CVE-2026-55789

8.5 · HIGH

Logto is the modern, open-source auth infrastructure for SaaS and AI apps.

Published Jul 10, 2026CWE-91EPSS 0.40%

Overview

CVE-2026-55789 is a high-severity vulnerability. It was published on July 10, 2026 and has a CVSS 3.1 base score of 8.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.5, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/logto-io/logto/commit/9097054860f0d638d90778d3dcde2ba050b844b6GitHubgithub.com/logto-io/logto/pull/9107GitHubgithub.com/logto-io/logto/releases/tag/v1.41.0GitHubgithub.com/logto-io/logto/security/advisories/GHSA-vfpw-vq44-4p63GitHubgithub.com/logto-io/logto/security/advisories/GHSA-vfpw-vq44-4p63

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55789?

CVE-2026-55789 is a high-severity vulnerability. It was published on July 10, 2026 and has a CVSS 3.1 base score of 8.5 (HIGH).

How severe is CVE-2026-55789?

This vulnerability has a CVSS 3.1 base score of 8.5, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-55789?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-55789?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55789 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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