CVE-2023-26359 Adobe ColdFusion Deserialization of Untrusted Data

Exploited in the wild Critical 9.8 Published 23 Mar 2023 Updated 21 Oct 2025

Attackers can execute arbitrary code via deserialization of untrusted data in Adobe ColdFusion without user interaction.

Exploited in the wild: Since 21 Aug 2023
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-26359?

CVE-2023-26359 is a critical unsafe deserialization vulnerability in Adobe Coldfusion, published on 23 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Adobe ColdFusion versions 2018 Update 15 (and earlier) and 2021 Update 5 (and earlier) are affected by a Deserialization of Untrusted Data vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue does not require user interaction.

Weakness: CWE-502

Which versions are affected by CVE-2023-26359?

It affects 1 product.

Products include Adobe Coldfusion.

How do I fix CVE-2023-26359?

No fix has been published for CVE-2023-26359 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 11 Sep 2023.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2023-26359 being exploited?

Yes. Attackers have exploited CVE-2023-26359 in the wild since at least 21 Aug 2023.

All Adobe Coldfusion vulnerabilities

Sources

Also known as GHSA-p4mq-mqpj-7xcj.