Deserialization of Untrusted Data in Adobe Connect - CVE-2026-27303
Published: April 17, 2026
Vulnerability identifier: #VU126377
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-27303
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to deserialization of untrusted data in Adobe Connect when processing untrusted serialized data. A remote attacker can deliver specially crafted data to execute arbitrary code.
User interaction is required.
Affected software
Adobe Connect
How to mitigate CVE-2026-27303
Install security update from vendor's website.
Adobe Connect - addressed in versions 12.11, 25.9