CVE-2026-87999Public exploitNetwork attack vector

Authenticated SSRF via globally routable address misclassification

Published Sep 9, 2026 · Updated Sep 10, 2026

SSRF in Open WebUI before 0.11.1 allows remote authenticated users to read reserved-address responses through server-side web fetches. The shared address screen in backend/open_webui/retrieval/web/utils.py treats Python's globally routable classification as proof that a destination is external. Exploitation requires a verified account and default address screening; Azure-hosted deployments expose the platform channel, while demonstrated impact is limited to reachability and response read-back.

CVSS severity7.1
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Open WebUI before 0.11.1 allows remote authenticated users to read reserved-address responses through server-side web fetches. The shared address screen in backend/open_webui/retrieval/web/utils.py treats Python's globally routable classification as proof that a destination is external. Exploitation requires a verified account and default address screening; Azure-hosted deployments expose the platform channel, while demonstrated impact is limited to reachability and response read-back.

The record

CVE
CVE-2026-87999
Published
Sep 9, 2026
Updated
Sep 10, 2026
Vendor
Open WebUI
Product
Open WebUI
Classifications
CWE-918, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 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=< 0.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open WebUI · Open WebUIversion=< 0.11.1

Published CVSS scores

7.1GitHubCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
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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