CVE-2026-55789Public exploitNetwork attack vector

Privilege escalation via signed SAML attribute injection

Published Jul 10, 2026 · Updated Jul 10, 2026

XML injection in Logto before 1.41.0 allows remote authenticated users to forge signed SAML attributes and escalate privileges. The packages/core SAML IdP passes user-controlled profile values to samlify 2.10.0 for raw substitution into XML element-text placeholders before signing. Exploitation requires low-privilege Logto access and a relying Service Provider that authorizes on SAML attributes, where forged roles are trusted.

CVSS severity8.5
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XML injection in Logto before 1.41.0 allows remote authenticated users to forge signed SAML attributes and escalate privileges. The packages/core SAML IdP passes user-controlled profile values to samlify 2.10.0 for raw substitution into XML element-text placeholders before signing. Exploitation requires low-privilege Logto access and a relying Service Provider that authorizes on SAML attributes, where forged roles are trusted.

The record

CVE
CVE-2026-55789
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
Logto
Product
Logto
Classifications
CWE-1395, CWE-91, T1068
Attack vector
network
Privileges
authenticated

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 privilegesauthenticated

What is affected?

Logto · Logtoversion=< 1.41.0

Published CVSS scores

8.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1395Dependency on Vulnerable Third-Party Component
CWE-91XML Injection (aka Blind XPath Injection)
T1068Exploitation for Privilege Escalation

Public exploit references

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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