CVE-2025-30316: Adobe Connect Stored XSS Vulnerability

CVE-2025-30316 Overview

CVE-2025-30316 is a stored Cross-Site Scripting (XSS) vulnerability affecting Adobe Connect versions 12.8 and earlier. The flaw allows a low-privileged authenticated attacker to inject malicious JavaScript into vulnerable form fields. When another user browses to a page containing the tainted field, the injected script executes in that user's browser session.

The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation). Successful exploitation requires user interaction and can result in session compromise, credential theft, or unauthorized actions performed within the victim's Adobe Connect context.

Critical Impact
Attackers with low-privilege accounts can persistently inject scripts that execute against any user visiting the affected page, enabling session hijacking and unauthorized actions across security domains.

Affected Products

Adobe Connect 12.8
Adobe Connect versions prior to 12.8
All Adobe Connect deployments exposing user-editable form fields

Discovery Timeline

2025-05-13 - CVE-2025-30316 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-30316

Vulnerability Analysis

Adobe Connect 12.8 and earlier fail to properly neutralize user-supplied input rendered inside application form fields. An authenticated attacker with low privileges can submit crafted payloads containing HTML or JavaScript. The application stores the payload and later returns it to other users without sufficient output encoding.

Because the payload is persisted server-side, every user who loads the affected page triggers script execution. The scope is Changed per the CVSS vector, meaning injected code can affect resources beyond the vulnerable component's own security authority. This is characteristic of stored XSS reaching into privileged UI contexts.

User interaction is required, but the interaction is limited to visiting a page containing the malicious content. Adobe rates the confidentiality and integrity impact as Low, and there is no direct availability impact.

Root Cause

The root cause is missing or insufficient input sanitization and output encoding on form fields within Adobe Connect. User-controlled data flows from HTTP input into the persistent data store and is later rendered into HTML responses without contextual escaping. This is a classic instance of CWE-79.

Attack Vector

Exploitation occurs over the network. An attacker authenticates to Adobe Connect with a low-privileged account and submits a JavaScript payload through an editable field, such as a profile, meeting, or content metadata input. The server persists the payload. When a victim, potentially an administrator or presenter, navigates to the affected page, the browser parses and executes the attacker's script within the Adobe Connect origin.

Common post-exploitation outcomes include stealing session cookies, performing forced actions via CSRF-style requests using the victim's session, and pivoting to phishing overlays that harvest credentials. Refer to the Adobe Security Advisory APSB25-36 for vendor-specific technical details.

Detection Methods for CVE-2025-30316

Indicators of Compromise

Form field values containing HTML tags such as <script>, <img onerror=>, <svg onload=>, or JavaScript URI schemes
Unusual outbound requests from user browsers to attacker-controlled domains referenced by injected scripts
Adobe Connect audit log entries showing profile, meeting, or content metadata edits by low-privileged accounts followed by administrator page loads
Session cookies appearing in web server logs of external hosts, indicating exfiltration via injected document.cookie calls

Detection Strategies

Deploy web application firewall rules that flag angle brackets, event handler attributes, and javascript: URIs submitted to Adobe Connect form endpoints
Enable Content Security Policy (CSP) reporting to detect script execution violations originating from stored content
Review Adobe Connect application logs for repeated edits to the same field, which can indicate payload tuning by an attacker

Monitoring Recommendations

Monitor for anomalous authenticated sessions issuing large volumes of edit requests to user-facing form endpoints
Correlate low-privileged account activity with subsequent administrator session anomalies such as unexpected privilege changes
Alert on network egress from browsers accessing Adobe Connect to previously unseen external domains

How to Mitigate CVE-2025-30316

Immediate Actions Required

Upgrade Adobe Connect to the fixed version released in Adobe Security Advisory APSB25-36
Audit existing form field content across profiles, meetings, and shared content for stored HTML or JavaScript payloads
Force session invalidation and require re-authentication after patching to terminate any hijacked sessions
Review recent administrator activity for actions that may have been triggered by injected scripts

Patch Information

Adobe published fixes for CVE-2025-30316 in Security Advisory APSB25-36. Administrators should apply the vendor-supplied update for Adobe Connect and confirm the deployed build is later than 12.8. Verify the fix by testing that HTML metacharacters submitted to previously vulnerable fields are properly encoded on rendering.

Workarounds

Restrict the ability to edit affected form fields to trusted, higher-privilege roles until patches are applied
Implement a strict Content Security Policy that disallows inline scripts and external script sources not required by Adobe Connect
Deploy a WAF signature that blocks common XSS payload patterns targeting Adobe Connect form submission endpoints

bash

# Example CSP header to reduce stored XSS impact
Content-Security-Policy: default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'; report-uri /csp-report