CVE-2026-54714Network attack vector

XSS via unescaped RelayState in SAML auto-submit form

Published Jul 10, 2026 · Updated Jul 10, 2026

Reflected XSS in Logto before 1.41.0 allows remote attackers to execute script on the tenant origin through a crafted SAML login. The generateAutoSubmitForm() function places RelayState, SAMLResponse, and actionUrl into HTML attributes without escaping them. Execution requires a configured SAML application and a user who completes login, after which injected script can act in that user's Logto session.

CVSS severity6.1
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Logto before 1.41.0 allows remote attackers to execute script on the tenant origin through a crafted SAML login. The generateAutoSubmitForm() function places RelayState, SAMLResponse, and actionUrl into HTML attributes without escaping them. Execution requires a configured SAML application and a user who completes login, after which injected script can act in that user's Logto session.

The record

CVE
CVE-2026-54714
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
Logto
Product
Logto
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.41.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Logto · Logtoversion=< 1.41.0

Published CVSS scores

6.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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