CVE-2025-30315: Adobe Connect Stored XSS Vulnerability

CVE-2025-30315 Overview

CVE-2025-30315 is a stored Cross-Site Scripting (XSS) vulnerability affecting Adobe Connect versions 12.8 and earlier. Attackers can inject malicious JavaScript into vulnerable form fields, which the application persists and later renders to other users. When a victim browses to a page containing the tainted field, the injected script executes in the victim's browser context.

The flaw is categorized under [CWE-79] Improper Neutralization of Input During Web Page Generation. Exploitation requires user interaction, but no authentication is needed to trigger the injection path. Adobe published fix guidance in security bulletin APSB25-36.

Critical Impact
Attackers can execute arbitrary JavaScript in a victim's browser session, enabling session token theft, credential harvesting, and unauthorized actions within Adobe Connect meeting rooms.

Affected Products

Adobe Connect 12.8 and earlier
Adobe Connect on-premises deployments
Adobe Connect hosted service instances running vulnerable builds

Discovery Timeline

2025-05-13 - CVE-2025-30315 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-30315

Vulnerability Analysis

Adobe Connect fails to properly sanitize user-supplied input before storing it in specific form fields. When the application later renders those fields to other users, the browser interprets the stored payload as executable JavaScript rather than inert text. This produces a stored (persistent) XSS condition, which is more damaging than reflected XSS because the payload triggers automatically for every visitor to the affected page.

The vulnerability sits in the client-facing rendering path of Adobe Connect meeting and content pages. Because Adobe Connect is used for virtual classrooms, webinars, and enterprise collaboration, injected scripts can reach large audiences before administrators detect them. The current EPSS probability is 0.235%, reflecting low observed exploitation activity, and no public proof-of-concept has been released.

Root Cause

The root cause is missing or insufficient output encoding when Adobe Connect writes previously submitted form field content back into HTML responses. Input validation on the server side does not neutralize HTML control characters such as <, >, and quote characters, allowing an attacker to break out of an attribute or text context and inject a <script> tag or event handler.

Attack Vector

An attacker submits a crafted payload containing JavaScript into a vulnerable Adobe Connect form field. The server stores the payload without escaping. A victim later loads the page hosting that field, and the browser executes the attacker's script under the origin of the Adobe Connect application. The scope change indicates the payload can affect resources beyond the vulnerable component, such as authenticated sessions in the same origin.

No verified public exploit code exists for this issue. See Adobe Security Bulletin APSB25-36 for vendor-supplied details.

Detection Methods for CVE-2025-30315

Indicators of Compromise

Unexpected <script>, <img onerror=>, or javascript: strings stored in Adobe Connect form fields, meeting names, or profile attributes
Outbound browser requests from Adobe Connect sessions to unfamiliar domains shortly after loading meeting or profile pages
Anomalous session cookie transmissions or credential submissions originating from Adobe Connect page contexts

Detection Strategies

Review Adobe Connect application logs and database records for HTML control characters (<, >, ") inside fields that should contain plaintext
Deploy Content Security Policy (CSP) violation reporting to surface inline script execution attempts on Adobe Connect pages
Inspect web application firewall (WAF) logs for POST requests containing script tags or common XSS payload signatures targeting Adobe Connect endpoints

Monitoring Recommendations

Alert on newly created or modified Adobe Connect content where field values contain HTML or JavaScript syntax
Monitor authenticated Adobe Connect user sessions for unusual API calls that could indicate session hijacking via XSS
Correlate browser telemetry with Adobe Connect access logs to identify users whose sessions execute unexpected scripts

How to Mitigate CVE-2025-30315

Immediate Actions Required

Upgrade Adobe Connect to a version later than 12.8 as directed in Adobe bulletin APSB25-36
Audit existing form field content for stored payloads and purge suspicious entries before applying the patch
Rotate session tokens and force re-authentication for users who accessed potentially affected pages

Patch Information

Adobe released a fixed build addressing CVE-2025-30315. Administrators should follow the upgrade guidance in the Adobe Security Bulletin APSB25-36 and validate the deployed version against the vendor's fixed release notes.

Workarounds

Restrict access to Adobe Connect administrative and content-creation roles to trusted users until patching is complete
Enforce a strict Content Security Policy that disallows inline scripts and restricts script sources to known origins
Place Adobe Connect behind a WAF configured with rules that block common XSS payload patterns in POST bodies

bash

# Example Content-Security-Policy header for Adobe Connect frontends
Content-Security-Policy: default-src 'self'; \
  script-src 'self' https://*.adobe.com; \
  object-src 'none'; \
  base-uri 'self'; \
  frame-ancestors 'self'; \
  report-uri /csp-report