Deserialization in Adobe Connect

CVE-2026-27303

Adobe Connect versions 2025.3, 12.10 and earlier are affected by a Deserialization of Untrusted Data vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must visit a maliciously crafted URL or interact with a compromised web page. Scope is changed.

Vulnerability class: Insecure Deserialization

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.019 (79.0th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-27303: rose from 0.006 to 0.019.

EPSS over last 30 days · oldest: 0.006 · newest: 0.019 · change: +0.013

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-27303?
CVE-2026-27303 is a critical-severity vulnerability in Adobe Connect, classified under Deserialization of Untrusted Data. CVSS score: 9.6/10. Published 2026-04-14.
How severe is CVE-2026-27303?
Critical severity. CVSS v3 base score is 9.6 out of 10.