Medium 6.1Published Jul 10, 2026

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

Updated under an hour ago (Oct 28, 2026, 2:10 AM ET)

Does this affect you?

It affects logto-io logto. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for logto-io logto

Exploited in the last 30 days

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.

CVSS: 6.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jul 13, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

logto-io logto logto_io:logto (from the name)	before 1.41.0	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.