Is CVE-2018-25353 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2018-25353 being exploited in the wild.

How severe is CVE-2018-25353?

High severity, with a CVSS score of 8.8, published 23 May 2026.

Which products and versions are affected?

Redaxo Mediapool Addon <= 5.5.1; Redaxo Redaxo CMS <= 5.5.1.

Is there a fix for CVE-2018-25353?

A patch was published on 2018-06-08: Fixed in Mediapool 2.4.0 and Redaxo CMS 5.6.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2018-25353 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2018-25353?

Check whether you run REDAXO Mediapool Addon house. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2018-25353: Redaxo CMS Mediapool Addon arbitrary file upload

Q: Is there a fix for CVE-2018-25353?

A patch was published on 2018-06-08: Fixed in Mediapool 2.4.0 and Redaxo CMS 5.6.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2018-25353 attacked?

It is attacked over the network, in a network appliance.

Q: Am I affected by CVE-2018-25353?

Check whether you run REDAXO Mediapool Addon house. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2018-25353 · Severity: high · CVSS 8.8 · Published 2026-05-23

Redaxo CMS, a content management system used for building and managing websites, contains a security flaw in its Mediapool component. An authorized user with basic editor permissions can bypass security filters to upload malicious files to the server. This could allow an attacker to take full control of the website, access sensitive data, or disrupt operations.

Vendors: REDAXO.

Quick answers

Is CVE-2018-25353 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2018-25353 being exploited in the wild.
How severe is CVE-2018-25353?: High severity, with a CVSS score of 8.8, published 23 May 2026.
Which products and versions are affected?: Redaxo Mediapool Addon <= 5.5.1; Redaxo Redaxo CMS <= 5.5.1.
Is there a fix for CVE-2018-25353?: A patch was published on 2018-06-08: Fixed in Mediapool 2.4.0 and Redaxo CMS 5.6.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2018-25353 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2018-25353?: Check whether you run REDAXO Mediapool Addon house. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An arbitrary file upload vulnerability exists in the Mediapool Addon (versions prior to 2.4.0) within Redaxo CMS (versions 5.5.1 and older). The vulnerability stems from an incomplete blacklist filter that blocks common PHP extensions but fails to account for version-specific extensions such as .php71 or .php53. An authenticated attacker with 'editor' privileges can upload a malicious script using these obfuscated extensions to bypass the filter. Once uploaded, the attacker can execute arbitrary code on the server, leading to full system compromise. The issue was addressed in Mediapool 2.4.0 and Redaxo CMS 5.6.0.

Affected products

Redaxo Mediapool Addon <= 5.5.1
Redaxo Redaxo CMS <= 5.5.1

Timeline

2018-03-08: disclosed: Vulnerability reported to vendor
2018-06-08: patched: Fixed in Mediapool 2.4.0 and Redaxo CMS 5.6.0
2018-06-13: other: Exploit-DB PoC published
2026-05-23: advisory: NVD/VulnCheck advisory published

References

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