CVE-2026-27303 Adobe Connect | Deserialization of Untrusted Data (CWE-502)
Attackers can execute arbitrary code by tricking users into visiting malicious URLs or pages in Adobe Connect.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-27303?
CVE-2026-27303 is a critical unsafe deserialization vulnerability in Adobe Connect, published on 14 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-502
Which versions are affected by CVE-2026-27303?
It affects 2 products.
Products include Adobe Connect, Adobe Connect Desktop Application.
How do I fix CVE-2026-27303?
No fix has been published for CVE-2026-27303 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-27303 being exploited?
There is no known exploitation of CVE-2026-27303 in the wild and no public exploit code.
Other vulnerabilities in Adobe Connect
- CVE-2017-11291 Server-side request forgery in Adobe Connect 9.6.2 and earlier versions
- CVE-2026-75682 Adobe Connect | Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') (CWE-89)
- CVE-2023-4661 SQLi in Saphira Connect
- CVE-2023-4662 RCE in Saphira Connect
- CVE-2021-40719 Adobe Connect Deserialization of Untrusted Data Remote Code Execution
Sources
Also known as GHSA-p85r-hffw-65q4.