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CVE-2026-27303: Adobe Connect | Deserialization of Untrusted Data (CWE-502)

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-14 · updated 2026-10-26
• Weakness: CWE-502

Description

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.

Affected products

• Adobe Connect: before 12.11 — fixed in 12.11
• Adobe Connect Desktop Application: through 2025.3; before 2025.9.15 — fixed in 2025.9.15

How to fix

Upgrade to a fixed version: Adobe Connect 12.11; Adobe Connect Desktop Application 2025.9.15. Check the vendor advisory for mitigations.

References

• https://helpx.adobe.com/security/products/connect/apsb26-37.html

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