Adobe Connect reflected XSS, unauthenticated (CVE-2026-27245)

Overview

A critical reflected Cross-Site Scripting (XSS) vulnerability has been identified in Adobe Connect. Tracked as CVE-2026-27245 with a CVSS score of 9.3, this flaw affects versions 2025.3, 12.10, and all earlier releases. The vulnerability allows an attacker to inject and execute malicious JavaScript code within a victim’s browser session.

Vulnerability Details

The vulnerability exists within specific web pages of the Adobe Connect application. It is a reflected XSS flaw, meaning the malicious script is delivered via a specially crafted URL. An attacker can exploit this by tricking an authenticated user into clicking a malicious link, often through phishing emails or other social engineering tactics. Successful exploitation executes the attacker’s code within the context of the victim’s browser session on the Adobe Connect server.

Impact

If exploited, this vulnerability allows an attacker to perform any actions within the permissions of the victim’s Adobe Connect session. This could include stealing session cookies to hijack accounts, accessing sensitive meeting data and recordings, manipulating user settings, or defacing the application interface. The attack requires no privileges (Privileges Required: NONE) and low attack complexity, making it a significant risk, though it does require user interaction.

Remediation and Mitigation

Adobe has released security updates to address this vulnerability. The primary and most effective action is to apply the vendor patch immediately.

Patch Guide: Administrators should upgrade their Adobe Connect deployments to a version released after the security fix. Consult the official Adobe Security Bulletin for the specific patched version numbers and download links.

Temporary Mitigation: If immediate patching is not possible, organizations should reinforce user awareness training against phishing attempts and suspicious links. Web Application Firewalls (WAFs) configured to detect and block XSS payloads may provide a layer of defense, but they are not a substitute for applying the official patch.

Security Insight

This high-severity XSS flaw in a widely used enterprise collaboration tool highlights the persistent risk of client-side attacks, even in mature applications. It serves as a reminder that social engineering remains a highly effective vector, as the technical exploit here relies entirely on a user clicking a link. For more on how such vulnerabilities can lead to data exposure, review recent incidents in our breach reports.

Further Reading

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