CVE-2026-48265: Adobe Experience Manager XSS Vulnerability

CVE-2026-48265 Overview

CVE-2026-48265 is a DOM-based Cross-Site Scripting (XSS) vulnerability affecting Adobe Experience Manager (AEM). The flaw exists in versions 6.5.24, LTS SP1, 2026.04, and earlier. An attacker can manipulate the DOM environment to execute malicious JavaScript within the victim's browser context. Exploitation requires user interaction, specifically a victim visiting a crafted webpage. The vulnerability has a changed scope, meaning the impact extends beyond the vulnerable component itself. This issue is tracked under [CWE-79] and falls within Adobe's APSB26-56 security bulletin.

Critical Impact
Successful exploitation allows attackers to execute arbitrary JavaScript in a victim's browser session, potentially leading to session hijacking, credential theft, or unauthorized actions within the AEM authoring environment.

Affected Products

Adobe Experience Manager 6.5.24 and earlier
Adobe Experience Manager LTS SP1 and earlier
Adobe Experience Manager Cloud Service version 2026.04 and earlier

Discovery Timeline

2026-06-09 - CVE-2026-48265 published to NVD
2026-06-10 - Last updated in NVD database

Technical Details for CVE-2026-48265

Vulnerability Analysis

The vulnerability is a DOM-based Cross-Site Scripting (XSS) issue classified under [CWE-79]. DOM-based XSS occurs when client-side JavaScript writes attacker-controlled data into the Document Object Model without proper sanitization. The malicious payload never reaches the server, making it harder to detect with traditional web application firewalls.

In Adobe Experience Manager, the flaw allows attackers to craft URLs or page elements that manipulate the DOM environment. When parsed by the browser, the payload executes JavaScript in the context of the AEM application origin. The scope change indicator means executed code can affect resources beyond the vulnerable component, including other authenticated sessions or administrative interfaces.

Root Cause

The root cause is improper neutralization of input during web page generation on the client side. AEM components fail to sanitize or encode user-controllable values before passing them to sinks such as innerHTML, document.write, or eval. Attackers leverage these sinks to inject script tags or event handlers that the browser interprets as executable code.

Attack Vector

The attack requires network access combined with user interaction. An attacker crafts a malicious URL or webpage containing the XSS payload and lures a victim, typically an authenticated AEM user, into visiting it. The attack also requires low-level privileges on the AEM instance. Once the victim's browser processes the crafted content, the injected JavaScript runs within the AEM origin, granting the attacker access to session cookies, CSRF tokens, and the ability to perform authenticated actions.

No public proof-of-concept exploit is currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. See the Adobe Security Patch APSB26-56 for vendor-supplied technical context.

Detection Methods for CVE-2026-48265

Indicators of Compromise

Unexpected <script> tags or inline event handlers appearing in AEM-rendered pages or component dialogs.
Outbound HTTP requests from authenticated AEM author sessions to attacker-controlled domains.
Anomalous DOM mutations in browser logs referencing AEM origin URLs.
Session token reuse from unexpected IP addresses following a user clicking an external link.

Detection Strategies

Monitor AEM access logs for requests containing suspicious URL fragments, encoded JavaScript keywords, or javascript: schemes targeting AEM endpoints.
Deploy Content Security Policy (CSP) reporting endpoints to capture violation reports indicating injected scripts.
Inspect browser console errors and CSP reports from internal AEM users for unexpected script-source violations.
Correlate authentication events with referer headers to detect users arriving from external crafted pages.

Monitoring Recommendations

Enable verbose logging on AEM dispatcher and author instances and forward logs to a centralized SIEM.
Track changes to AEM content pages, components, and client libraries for unauthorized modifications.
Alert on outbound network traffic from author workstations to newly observed or low-reputation domains.

How to Mitigate CVE-2026-48265

Immediate Actions Required

Apply Adobe's security update referenced in Adobe Security Patch APSB26-56 to all affected AEM instances.
Restrict access to AEM author instances to trusted networks and VPN connections.
Educate AEM users with content authoring privileges about phishing links and unsolicited URLs.
Rotate session tokens and force re-authentication for privileged AEM accounts after patching.

Patch Information

Adobe addressed CVE-2026-48265 in security bulletin APSB26-56. Administrators should upgrade Adobe Experience Manager 6.5.24 to the patched service pack, update LTS deployments beyond SP1, and ensure AEM Cloud Service environments are running a release later than 2026.04. Refer to the Adobe Security Patch APSB26-56 for exact version mappings.

Workarounds

Enforce a strict Content Security Policy that disallows unsafe-inline and restricts script sources to trusted origins.
Configure the AEM dispatcher to filter suspicious query parameters and reject requests containing script-like payloads.
Apply the HttpOnly and Secure flags to AEM session cookies to limit token theft via injected scripts.

bash

# Example Content Security Policy header for AEM dispatcher
Header always set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self';"
Header always set X-XSS-Protection "1; mode=block"
Header always set X-Content-Type-Options "nosniff"