CVE-2026-34659 | Adobe Connect | Deserialization of Untrusted Data (CWE-502)

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.

Published: 2026-05-12 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-34659 is rated High Risk (69.5/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 3.74%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-34659

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-18 3.47% 3.74% +0.28%
2 2026-05-14 1.50% 3.47% +1.96%
3 2026-05-13 — 1.50% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-34659

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.6 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 6.0 [email protected]

Weakness enumeration for CVE-2026-34659

GitHub Security Advisory for CVE-2026-34659

GHSA-6cgj-r9r8-5xrr · Severity: critical — Adobe Connect versions 2025.9.15, 2025.8.157 and earlier are affected by a Deserialization of...

Affected software / configurations for CVE-2026-34659

Vendor Product Version Raw CPE
adobe connect_desktop_application <= 2025.8.157 cpe:2.3:a:adobe:connect_desktop_application:*:*:*:*:*:macos:*:*
adobe connect_desktop_application 2025.9.15 cpe:2.3:a:adobe:connect_desktop_application:2025.9.15:*:*:*:*:windows:*:*

References for CVE-2026-34659

cvelogic Threat Intelligence