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 vul…

Vulnerability class: Insecure Deserialization

EPSS: 0.037 (88.2th 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 — 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.