CVE-2026-75698: Adobe Connect Reflected XSS Vulnerability

CVE-2026-75698 Overview

CVE-2026-75698 is a reflected Cross-Site Scripting (XSS) vulnerability affecting Adobe Connect. An attacker can inject malicious scripts into a web page rendered by the application, enabling script execution in the victim's browser context. Successful exploitation can lead to elevated access or control over the victim's account or session. The flaw requires user interaction: a victim must visit a maliciously crafted URL or interact with a compromised page. The scope is changed, meaning the injected script can affect resources beyond the vulnerable component's security authority. Adobe published the issue under advisory APSB26-150.

Critical Impact
A reflected XSS with changed scope allows attackers to hijack sessions, escalate privileges, and pivot into resources outside the affected component's trust boundary.

Affected Products

Adobe Connect (see Adobe Security Advisory APSB26-150 for specific affected versions)

Discovery Timeline

2026-09-22 - CVE-2026-75698 published to the National Vulnerability Database (NVD)
2026-09-23 - Last updated in the NVD database

Technical Details for CVE-2026-75698

Vulnerability Analysis

The vulnerability is classified under [CWE-79] Improper Neutralization of Input During Web Page Generation. Adobe Connect reflects attacker-controlled input into HTTP responses without sufficient encoding or validation. When a victim loads a crafted URL, the injected payload executes inside the victim's browser under the origin of the Adobe Connect application.

Because the CVSS scope is changed, the executed script can access resources or data outside the vulnerable component's security context. Attackers can leverage this behavior to read authenticated content, invoke privileged API calls, and impersonate the victim across integrated Adobe Connect features.

The attack requires user interaction but no authentication. This lowers the barrier to exploitation and makes phishing-style delivery an effective distribution mechanism for weaponized URLs.

Root Cause

Adobe Connect fails to properly neutralize user-supplied input before including it in server-generated responses. Reflected parameters carry markup or script content that browsers execute as active DOM elements rather than treating as inert text.

Attack Vector

The attack vector is network-based. An attacker crafts a URL containing a malicious script payload targeting a vulnerable Adobe Connect endpoint. The attacker distributes this URL through email, chat, or a compromised web page. When the victim clicks the link while authenticated, the reflected payload executes and can exfiltrate session tokens, submit actions on the victim's behalf, or redirect the browser to attacker-controlled infrastructure.

No verified proof-of-concept exploit code has been published. Refer to Adobe Security Advisory APSB26-150 for vendor technical details.

Detection Methods for CVE-2026-75698

Indicators of Compromise

HTTP request logs containing script tags, javascript: URIs, or event handler attributes (onerror, onload) in query parameters or form fields targeting Adobe Connect endpoints.
Outbound browser requests to unfamiliar domains immediately following user access to Adobe Connect URLs shared via email or messaging.
Session token or cookie transmission to non-Adobe destinations in web proxy logs.

Detection Strategies

Deploy web application firewall (WAF) rules that inspect query strings and POST bodies for encoded and unencoded XSS payloads targeting Adobe Connect paths.
Correlate email gateway data with web proxy logs to identify links that deliver users to Adobe Connect URLs containing suspicious parameters.
Enable Content Security Policy (CSP) violation reporting on Adobe Connect to surface unexpected inline script execution attempts.

Monitoring Recommendations

Monitor authentication and session activity for anomalous API calls originating from active user sessions shortly after link clicks.
Alert on user accounts performing administrative changes from unusual client fingerprints or geographic locations.
Track referrer headers on outbound requests from Adobe Connect to detect scripted redirection to attacker infrastructure.

How to Mitigate CVE-2026-75698

Immediate Actions Required

Apply the security update referenced in Adobe Security Advisory APSB26-150 to all Adobe Connect deployments.
Invalidate active Adobe Connect sessions and rotate credentials for privileged accounts after patching.
Notify users to avoid clicking Adobe Connect links from untrusted sources until remediation is complete.

Patch Information

Adobe released a patch for CVE-2026-75698 as part of security bulletin APSB26-150. Administrators should consult the advisory to identify the fixed version applicable to their deployment and schedule an update. On-premises operators must plan a maintenance window, while hosted customers should confirm the service tier has received the update.

Workarounds

Enforce a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins for the Adobe Connect application.
Configure WAF signatures to block requests containing common XSS payload patterns against Adobe Connect URLs.
Restrict Adobe Connect access to authenticated users on trusted networks through VPN or zero-trust access controls until the patch is deployed.

bash

# Example WAF rule concept (ModSecurity syntax) to block reflected XSS payloads
SecRule REQUEST_URI "@contains /connect/" \
  "chain,phase:2,deny,status:403,id:1075698,msg:'Potential XSS targeting Adobe Connect'"
  SecRule ARGS "@rx (?i)(<script|javascript:|onerror=|onload=)" "t:none,t:urlDecodeUni"