Hazard

Is CVE-2023-26359 being exploited?

Confirmed exploited in the wild

CISA has evidence of active exploitation. This is not theoretical risk — someone has already used it against someone.

Adobe ColdFusion Deserialization of Untrusted Data Vulnerability

Adobe · ColdFusion

CVSS 9.8 EPSS 18% no public exploit indexed Fix deadline passed 11 September 2023

What it is

Adobe ColdFusion contains a deserialization of untrusted data vulnerability that could result in code execution in the context of the current user.

Why we say that

  • CISA's federal remediation deadline (2023-09-11) has passed
  • CVSS 9.8 critical
  • Listed in the CISA Known Exploited Vulnerabilities catalogue

Every line above comes from a named public source. Where the evidence is thin, we say so rather than inventing confidence — see methodology.

What to do

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

What it costs when this goes wrong

This is where UK enforcement meets the vulnerability record. Where an unfixed vulnerability leads to a breach, the ICO treats it as a security failure under UK GDPR. Recent cases:

All UK cases caused by unpatched software →