Adobe Connect RCE Flaw: Critical Deserialization Bug Exposed
National Vulnerability Database is flagging a critical deserialization vulnerability impacting Adobe Connect. Identified as CVE-2026-27303, this flaw affects versions 2025.3, 12.10, and earlier. The danger lies in its potential for arbitrary code execution within the user’s current context, a particularly nasty outcome since it doesn’t require any user interaction to exploit.
The severity is underscored by a CVSS score of 9.6, placing it firmly in the ‘CRITICAL’ category. The vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H indicates a network-accessible attack with low complexity, no privileges required, and a scope change, meaning the vulnerability can affect components beyond its own security scope. This is a serious concern for organizations relying on Adobe Connect for collaboration and meetings.
Related ATT&CK Techniques
🛡️ Detection Rules
7 rules · 5 SIEM formats7 auto-generated detection rules for this incident, mapped to MITRE ATT&CK. Available in Sigma, Splunk SPL, Sentinel KQL, Elastic Lucene, and QRadar AQL.
Web Application Exploitation Attempt — Adobe Connect RCE Flaw: Critical Deseria
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Get Detection Rules →Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-27303 | Deserialization | Adobe Connect versions 2025.3 and earlier |
| CVE-2026-27303 | Deserialization | Adobe Connect versions 12.10 and earlier |
| CVE-2026-27303 | RCE | Arbitrary code execution via Deserialization of Untrusted Data |
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