# 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.

- **Severity:** Critical 9.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`)
- **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 available:** No
- **Published:** 14 Apr 2026
- **Updated:** 27 Aug 2026
- **Also known as:** GHSA-p85r-hffw-65q4

## 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 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2026-27303?

It affects 2 products.


Products: 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.

## 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](https://insights.sbomify.com/CVE-2017-11291/): Server-side request forgery in Adobe Connect 9.6.2 and earlier versions (critical 10.0)
- [CVE-2026-75682](https://insights.sbomify.com/CVE-2026-75682/): Adobe Connect | Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') (CWE-89) (critical 9.9)
- [CVE-2023-4661](https://insights.sbomify.com/CVE-2023-4661/): SQLi in Saphira Connect (critical 9.8)
- [CVE-2023-4662](https://insights.sbomify.com/CVE-2023-4662/): RCE in Saphira Connect (critical 9.8)
- [CVE-2021-40719](https://insights.sbomify.com/CVE-2021-40719/): Adobe Connect Deserialization of Untrusted Data Remote Code Execution (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-27303 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-27303 in the wild and no public exploit code.

Affected product: Adobe Connect. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-27303/ (Markdown: https://insights.sbomify.com/CVE-2026-27303/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27303
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27303
- OSV: https://osv.dev/vulnerability/CVE-2026-27303

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-27303/
Summaries are generated and may contain mistakes; the official description above is the record.