CVE-2026-56702Public exploitNetwork attack vectorHinoki check available

Authenticated code execution via permissive upload allowlist

Published Aug 25, 2026 · Updated Aug 27, 2026

Unrestricted file upload in Adminer before 5.4.3 allows remote authenticated users to execute PHP code through AdminerFileUpload. The plugin's optional end-anchored extension regex accepts every filename, and its permissive default preserves PHP extensions when moving uploads. Execution as the web-server user requires an _path column and an uploadPath that the web server exposes and interprets as PHP.

CVSS severity7.1
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Unrestricted file upload in Adminer before 5.4.3 allows remote authenticated users to execute PHP code through AdminerFileUpload. The plugin's optional end-anchored extension regex accepts every filename, and its permissive default preserves PHP extensions when moving uploads. Execution as the web-server user requires an _path column and an uploadPath that the web server exposes and interprets as PHP.

The record

CVE
CVE-2026-56702
Published
Aug 25, 2026
Updated
Aug 27, 2026
Vendor
Adminer
Product
Adminer
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 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 <5.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Adminer · Adminerversion=0 <5.4.3

Published CVSS scores

8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/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 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-434Unrestricted Upload of File with Dangerous Type
T1505.003Server Software Component: Web Shell

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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