What’s Vulnerable › Vulnerabilities

CVE-2026-54714: Logto: XSS via unescaped RelayState in SAML auto-submit form

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-10 · updated 2026-10-25
• Weakness: CWE-79

Description

Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, @logto/core reflected the SAML RelayState, SAMLResponse, and actionUrl into a Logto-origin auto-submit HTML form in packages/core/src/saml-application/SamlApplication/utils.ts without HTML-attribute escaping. A SAML application flow with a crafted RelayState from GET or POST /api/saml/:id/authn could inject script that runs on the Logto tenant origin after the user completes login. This issue is fixed in version 1.41.0.

Affected products

• logto-io logto: before 1.41.0

References

• https://github.com/logto-io/logto/commit/209fa0a5cbe8522f9cf31873239dc6424099bb5e
• https://github.com/logto-io/logto/pull/9008
• https://github.com/logto-io/logto/releases/tag/v1.41.0
• https://github.com/logto-io/logto/security/advisories/GHSA-cpm5-w86q-w85f

Get alerted when CVE-2026-54714 or the next vulnerability affects your stack