Adobe ColdFusion Deserialization of Untrusted Data Vulnerability
CVE-2023-26359 is a security vulnerability in Adobe ColdFusion, added to CISA KEV on August 21, 2023. Patch priority: Patch this week.
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.
Who's affected
Affects anyone running Adobe ColdFusion. If it's part of your document workflow, exploitation can lead to code execution when a user opens an attacker-controlled file.
What to do
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
If you don't have someone in-house to verify the patch deployed across every endpoint — or you're not sure whether you're affected — that's exactly the kind of triage we do. Book a free 20-minute triage call.
Insurance readiness
Your insurer will ask if this is patched.
Unpatched entries on CISA's Known Exploited Vulnerabilities list are exactly what cyber-insurance carrier questionnaires probe for, and knowing which controls they check is how you keep a renewal from stalling.
Get the free carrier questionnaire →Severity
CVSS base score: 9.8 — CRITICAL
Weakness classification: CWE-502
CISA due date
Federal deadline: September 11, 2023. Federal agencies must complete the required action by this date. For private SMBs the deadline is advisory — but treat it as a strong recommendation, especially if you handle regulated data (HIPAA, GLBA, ABA model rules).
EPSS
EPSS score: 17.9% — higher than 97% of all scored CVEs.
EPSS estimates the probability of exploitation activity in the next 30 days. Every entry on this site is already confirmed exploited, so read it as relative urgency among the things you still have open, not as permission to wait.
Other exploited Adobe ColdFusion entries
More CISA KEV entries for Adobe ColdFusion. Same product line, same actively-exploited status.
Source
This entry comes from CISA's Known Exploited Vulnerabilities catalog, public US-Government data we pull daily. The plain-language framing and the what-to-do guidance above are ours. View the original entry on cisa.gov.