CVE-2018-25353Public exploitNetwork attack vector

Authenticated code execution via incomplete extension blacklist

Published May 23, 2026 · Updated May 23, 2026

Arbitrary file upload in REDAXO Mediapool 5.5.1 and earlier allows remote authenticated users to execute PHP via crafted extensions. The Mediapool upload blacklist rejects php, php4, php5, php6, and php7 but fails to match obfuscated PHP extensions such as php53 and php71. An editor account with upload access is required; a successful upload places attacker-controlled executable content on the web server for code execution.

CVSS severity8.7
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in REDAXO Mediapool 5.5.1 and earlier allows remote authenticated users to execute PHP via crafted extensions. The Mediapool upload blacklist rejects php, php4, php5, php6, and php7 but fails to match obfuscated PHP extensions such as php53 and php71. An editor account with upload access is required; a successful upload places attacker-controlled executable content on the web server for code execution.

The record

CVE
CVE-2018-25353
Published
May 23, 2026
Updated
May 23, 2026
Vendor
REDAXO
Product
Mediapool
Classifications
CWE-863, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 23, 2026CVE publishedPublication date reported by the CVE source.
  2. May 23, 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 <=5.5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

REDAXO · Mediapoolversion=0 <=5.5.1

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/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.

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-863Incorrect Authorization
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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