CVE-2026-86863Public exploitNetwork attack vectorHinoki check available

Unauthenticated account takeover via client-controlled identity headers

Published Sep 17, 2026 · Updated Sep 17, 2026

Authentication bypass in pgAdmin 4 6.2 through 9.17 allows remote attackers to impersonate users via Webserver identity headers. WebserverAuthentication.get_user() falls back from the WSGI environment to untrusted request headers; header-derived environment names also accept client input. Exploitation requires network access and webserver in AUTHENTICATION_SOURCES, which defaults to internal, and grants the named account's privileges, including an existing Administrator's control of the installation.

CVSS severity9.3
Critical
EPSS probability0.58%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authentication bypass in pgAdmin 4 6.2 through 9.17 allows remote attackers to impersonate users via Webserver identity headers. WebserverAuthentication.get_user() falls back from the WSGI environment to untrusted request headers; header-derived environment names also accept client input. Exploitation requires network access and webserver in AUTHENTICATION_SOURCES, which defaults to internal, and grants the named account's privileges, including an existing Administrator's control of the installation.

The record

CVE
CVE-2026-86863
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
pgAdmin Development Team
Product
pgAdmin 4
Classifications
CWE-290, CWE-807, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=6.2 <9.18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

pgAdmin Development Team · pgAdmin 4version=6.2 <9.18

Published CVSS scores

9.3PostgreSQL CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8PostgreSQL CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing
CWE-807Reliance on Untrusted Inputs in a Security Decision
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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