CVE-2026-75684 Overview
Adobe Connect contains a stored Cross-Site Scripting (XSS) vulnerability [CWE-79] that allows attackers to inject malicious JavaScript into vulnerable form fields. When a victim loads the page containing the injected payload, the script executes in their browser context. Attackers can leverage this behavior to hijack sessions, escalate privileges, or take control of victim accounts.
The vulnerability carries a changed scope, meaning the injected script can affect resources beyond the vulnerable component itself. Exploitation requires user interaction, such as visiting a crafted or compromised page within the Adobe Connect application.
Critical Impact
Stored XSS in Adobe Connect enables session hijacking and account takeover through malicious script execution in a victim's browser.
Affected Products
- Adobe Connect (see Adobe Security Patch APSB26-150 for affected versions)
Discovery Timeline
- 2026-09-22 - CVE-2026-75684 published to NVD
- 2026-09-22 - Last updated in NVD database
Technical Details for CVE-2026-75684
Vulnerability Analysis
The vulnerability is a stored Cross-Site Scripting flaw in Adobe Connect. The application fails to properly sanitize or encode user-supplied input submitted through specific form fields. Attacker-controlled JavaScript persists in server-side storage and renders unescaped when other users view the affected page.
Because the payload is stored rather than reflected, every user who loads the compromised page becomes a potential victim. The changed CVSS scope reflects the ability of the injected script to interact with resources under a different security authority, such as parent pages, other application components, or authenticated user sessions.
Successful exploitation can yield full compromise of session tokens, authentication cookies, and any actions the victim is authorized to perform within Adobe Connect.
Root Cause
The root cause is improper neutralization of input during web page generation [CWE-79]. Adobe Connect stores unvalidated form input containing HTML or JavaScript and later serves it back to users without contextual output encoding. The application does not enforce a strict Content Security Policy that would block inline script execution.
Attack Vector
An unauthenticated attacker submits a crafted payload containing JavaScript into a vulnerable form field over the network. The payload is stored server-side. When a legitimate user, potentially a privileged administrator, browses to the affected page, the browser parses and executes the attacker-controlled script.
The attacker can then exfiltrate cookies, perform actions on behalf of the victim, or pivot deeper into the meeting environment. Technical exploitation details are described in the Adobe Security Patch APSB26-150 advisory.
Detection Methods for CVE-2026-75684
Indicators of Compromise
- Form field submissions containing <script>, onerror=, onload=, or javascript: sequences in Adobe Connect application logs.
- Unexpected outbound requests from user browsers to attacker-controlled domains after loading Adobe Connect pages.
- Anomalous session token reuse from geographically distinct IP addresses following visits to shared meeting or content pages.
Detection Strategies
- Inspect web application firewall (WAF) logs for XSS payload patterns targeting Adobe Connect form endpoints.
- Review stored content in Adobe Connect databases for HTML or JavaScript characters in fields expected to hold plain text.
- Correlate authentication events with browser telemetry to identify session hijacking that follows Adobe Connect page loads.
Monitoring Recommendations
- Enable verbose logging on Adobe Connect input handlers and periodically audit stored user-generated content.
- Monitor Content Security Policy violation reports if CSP is configured in report-only or enforce mode.
- Alert on privileged account activity originating from sessions established shortly after loading pages containing user-supplied content.
How to Mitigate CVE-2026-75684
Immediate Actions Required
- Apply the security update referenced in Adobe Security Patch APSB26-150 as soon as possible.
- Audit existing Adobe Connect content and form fields for previously stored malicious payloads and remove them.
- Rotate session tokens and force reauthentication for privileged accounts that may have accessed affected pages.
Patch Information
Adobe has released fixes for this vulnerability. Refer to the Adobe Security Patch APSB26-150 advisory for patched versions, download links, and installation guidance.
Workarounds
- Restrict access to Adobe Connect to trusted networks and authenticated users until patching is complete.
- Deploy a WAF rule set that blocks common XSS payload patterns on Adobe Connect form endpoints.
- Enforce a strict Content Security Policy that disallows inline scripts and untrusted script sources.
- Educate users to avoid clicking untrusted meeting or content links within Adobe Connect during the exposure window.
# Configuration example
# Example WAF rule concept blocking common stored XSS payloads on Adobe Connect endpoints
# (adapt syntax to your WAF vendor)
SecRule ARGS "@rx (?i)(<script|onerror\s*=|onload\s*=|javascript:)" \
"id:1075684,phase:2,deny,status:403,msg:'CVE-2026-75684 XSS payload blocked'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
