CVE-2026-86259Network attack vector

Unauthenticated SSRF via environment-gated provider URL validation

Published Sep 6, 2026 · Updated Sep 8, 2026

SSRF in THU-MAIC OpenMAIC 1.0.0 and earlier allows remote attackers to read cloud metadata via attacker-controlled provider URLs. Provider routes accept x-base-url or baseUrl values, while middleware fails open without ACCESS_CODE and validateUrlForSSRF runs only in production. The default unset access code plus a non-production build exposes cloud credentials and other metadata without authentication.

CVSS severity9.0
Critical
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in THU-MAIC OpenMAIC 1.0.0 and earlier allows remote attackers to read cloud metadata via attacker-controlled provider URLs. Provider routes accept x-base-url or baseUrl values, while middleware fails open without ACCESS_CODE and validateUrlForSSRF runs only in production. The default unset access code plus a non-production build exposes cloud credentials and other metadata without authentication.

The record

CVE
CVE-2026-86259
Published
Sep 6, 2026
Updated
Sep 8, 2026
Vendor
THU-MAIC
Product
OpenMAIC
Classifications
CWE-306, CWE-668, CWE-918, T1552.005, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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 <1.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

THU-MAIC · OpenMAICversion=0 <1.0.1

Published CVSS scores

9.0GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:H/SI:N/SA: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.

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

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-306Missing Authentication for Critical Function
CWE-668Exposure of Resource to Wrong Sphere
CWE-918Server-Side Request Forgery (SSRF)
T1552.005Cloud Instance Metadata API
T1190Exploit Public-Facing Application

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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