CVE-2026-5803Public exploitNetwork attack vector

Internal service access via unvalidated proxy URL

Published Apr 8, 2026 · Updated Apr 8, 2026

SSRF in bigsk1 OpenAI Realtime UI allows remote authenticated users to make the server request attacker-chosen URLs. The /api/proxy handler reads req.query.url, appends remaining query parameters, and passes the resulting URL directly to fetch without validating its scheme, resolved address, or redirects. Network access to the HTTP route and low-privilege authentication are sufficient at commit 188ccde27fdf3d8fab8da81f3893468f53b2797c; reachable loopback, private, link-local, or metadata services can have their responses disclosed.

CVSS severity6.3
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in bigsk1 OpenAI Realtime UI allows remote authenticated users to make the server request attacker-chosen URLs. The /api/proxy handler reads req.query.url, appends remaining query parameters, and passes the resulting URL directly to fetch without validating its scheme, resolved address, or redirects. Network access to the HTTP route and low-privilege authentication are sufficient at commit 188ccde27fdf3d8fab8da81f3893468f53b2797c; reachable loopback, private, link-local, or metadata services can have their responses disclosed.

The record

CVE
CVE-2026-5803
Published
Apr 8, 2026
Updated
Apr 8, 2026
Vendor
bigsk1
Product
OpenAI Realtime UI
Classifications
CWE-918, CAPEC-664, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 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=188ccde27fdf3d8fab8da81f3893468f53b2797c

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

bigsk1 · OpenAI Realtime UIversion=188ccde27fdf3d8fab8da81f3893468f53b2797c

Published CVSS scores

6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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)
CAPEC-664Server Side Request Forgery
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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