The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added a critical security flaw in Adobe ColdFusion to its Known Exploited Vulnerabilities (KEV) catalog, based on evidence of active exploitation.
The vulnerability, cataloged as CVE-2023-26359 (CVSS score: 9.8), relates to a deserialization flaw present in Adobe ColdFusion 2018 (Update 15 and earlier) and ColdFusion 2021 (Update 5 and earlier) that could result in arbitrary code execution in the context of the current user without requiring any interaction.
Deserialization (aka unmarshaling) refers to the process of reconstructing a data structure or an object from a byte stream. But when it's performed without validating its source or sanitizing its contents, it can lead to unexpected consequences such as code execution or denial-of-service (DoS).
It was patched by Adobe as part of updates issued in March 2023. As of writing, it's immediately not clear how the flaw is being abused in the wild.
That said, the development comes more than five months after CISA placed another flaw impacting the same product (CVE-2023-26360) to the KEV catalog. Adobe said it's aware of the weakness being exploited in "very limited attacks" aimed at ColdFusion.
In light of active exploitation, Federal Civilian Executive Branch (FCEB) agencies are required to apply the necessary patches by September 11, 2023, to protect their networks against potential threats.
