CVE-2026-56677Public exploitNetwork attack vectorHinoki check available

Internal service discovery via issuerUrl SSRF

Published Aug 17, 2026 · Updated Aug 18, 2026

Server-side request forgery in Decolua 9Router 0.5.4 and earlier allows remote attackers to scan internal services via issuerUrl. The POST /api/auth/oidc/test handler passes the user-supplied issuerUrl to fetchOidcDiscovery(), which requests /.well-known/openid-configuration without blocking loopback or private-network destinations and then reflects parsed fields such as token_endpoint and jwks_uri. Reachability depends on dashboard login being disabled; under that condition, no session is required and successful probes can confirm internal HTTP services or disclose returned OIDC metadata.

CVSS severity8.6
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Server-side request forgery in Decolua 9Router 0.5.4 and earlier allows remote attackers to scan internal services via issuerUrl. The POST /api/auth/oidc/test handler passes the user-supplied issuerUrl to fetchOidcDiscovery(), which requests /.well-known/openid-configuration without blocking loopback or private-network destinations and then reflects parsed fields such as token_endpoint and jwks_uri. Reachability depends on dashboard login being disabled; under that condition, no session is required and successful probes can confirm internal HTTP services or disclose returned OIDC metadata.

The record

CVE
CVE-2026-56677
Published
Aug 17, 2026
Updated
Aug 18, 2026
Vendor
Decolua
Product
9Router
Classifications
CWE-918, CWE-306, T1046, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 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=<= 0.5.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Decolua · 9Routerversion=<= 0.5.4

Published CVSS scores

8.6GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

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 exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CWE-306Missing Authentication for Critical Function
T1046Network Service Scanning
T1190Exploit Public-Facing Application

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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