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
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 (79.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.019 · change: +0.012
Affected products
- Adobe Connect — versions 0
- Adobe Connect Desktop Application
- Adobe Connect Desktop Application — versions 2025.9.15
Weakness classification (CWE)
References
- helpx.adobe.com/security/products/connect/apsb26-50.html (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.