What is CVE-2026-34659?

CVE-2026-34659 is a critical-severity vulnerability in Adobe Connect, classified under Deserialization of Untrusted Data. CVSS score: 9.6/10. Published 2026-05-12.

How severe is CVE-2026-34659?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Deserialization in Adobe Connect

CVE-2026-34659

Adobe Connect versions 2025.9.15, 2025.8.157 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. An attacker could exploit this vulnerability to execute arbitrary code. 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

EPSS: 0.006 (48.1th percentile) — read the EPSS interpretation.

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.

Affected products

Adobe Connect — versions 0
Adobe Connect Desktop Application
Adobe Connect_desktop_application — versions 2025.9.15

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

psirt@adobe.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-34659?: CVE-2026-34659 is a critical-severity vulnerability in Adobe Connect, classified under Deserialization of Untrusted Data. CVSS score: 9.6/10. Published 2026-05-12.
How severe is CVE-2026-34659?: Critical severity. CVSS v3 base score is 9.6 out of 10.