CVE-2026-56739Public exploitNetwork attack vectorHinoki check available

Internal data and credential disclosure via SSRF

Published Sep 24, 2026 · Updated Sep 24, 2026

SSRF in Logto before 1.43.0 allows remote authenticated users with tenant administrative access to read internal data. Webhook delivery and SSO connector code fetch administrator-supplied destinations without validating the connected address, and OAuth2 user-info requests forward access tokens. Exploitation requires tenant administrative configuration access and can expose private-network responses or upstream provider credentials.

CVSS severity8.2
High
EPSS probability0.30%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

SSRF in Logto before 1.43.0 allows remote authenticated users with tenant administrative access to read internal data. Webhook delivery and SSO connector code fetch administrator-supplied destinations without validating the connected address, and OAuth2 user-info requests forward access tokens. Exploitation requires tenant administrative configuration access and can expose private-network responses or upstream provider credentials.

The record

CVE
CVE-2026-56739
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
Logto
Product
Logto
Classifications
CWE-918, T1552.005
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 1.43.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Logto · Logtoversion=< 1.43.0

Published CVSS scores

8.2GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1552.005Unsecured Credentials: Cloud Instance Metadata API

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started