CVE-2026-54714

MEDIUM

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

Title source: cna

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.

References (4)

Core 4

Core References

X_Refsource_Confirm x_refsource_confirm

https://github.com/logto-io/logto/security/advisories/GHSA-cpm5-w86q-w85f

X_Refsource_Misc x_refsource_misc

https://github.com/logto-io/logto/pull/9008

X_Refsource_Misc x_refsource_misc

https://github.com/logto-io/logto/commit/209fa0a5cbe8522f9cf31873239dc6424099bb5e

View Writeup ZIP pw:eip

X_Refsource_Misc x_refsource_misc

https://github.com/logto-io/logto/releases/tag/v1.41.0

Scores

CVSS v3 6.1

EPSS 0.0025

EPSS Percentile 16.8%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-79

Status published

Products (1)

logto-io/logto < 1.41.0

Published Jul 10, 2026

Tracked Since Jul 11, 2026