CVE-2026-48260: Adobe Experience Manager XSS Vulnerability

CVE-2026-48260 Overview

CVE-2026-48260 is a DOM-based Cross-Site Scripting (XSS) vulnerability affecting Adobe Experience Manager (AEM). An attacker can manipulate the DOM environment to execute arbitrary JavaScript within the victim's browser context. Exploitation requires user interaction: the victim must visit a crafted webpage. The vulnerability has a changed scope, meaning impact extends beyond the vulnerable component. The flaw is categorized under [CWE-79] (Improper Neutralization of Input During Web Page Generation).

Critical Impact
Successful exploitation allows attackers to execute malicious JavaScript in the victim's browser, potentially leading to session hijacking, credential theft, or unauthorized actions within AEM-hosted applications.

Affected Products

Adobe Experience Manager (AEM Cloud Service)
Adobe Experience Manager 6.5 LTS (base release)
Adobe Experience Manager 6.5 LTS Service Packs SP1 and SP2

Discovery Timeline

2026-07-14 - CVE-2026-48260 published to NVD
2026-07-17 - Last updated in NVD database

Technical Details for CVE-2026-48260

Vulnerability Analysis

CVE-2026-48260 is a DOM-based XSS flaw in Adobe Experience Manager. Unlike reflected or stored XSS, DOM-based XSS occurs entirely within the client-side script execution environment. The vulnerable JavaScript reads attacker-controllable data from the DOM and writes it into a sink that triggers script execution without proper sanitization.

The attack requires low privileges and user interaction. Because the scope is changed, code executing in the browser can impact resources beyond the vulnerable AEM component, including cookies, storage, or other origins accessible through the compromised session. The EPSS probability stands at 0.168%, indicating a low likelihood of widespread exploitation in the near term.

Root Cause

The root cause is improper neutralization of user-controllable input before it reaches a JavaScript execution sink in the client-side code. Common DOM XSS sinks include innerHTML, document.write(), eval(), and setTimeout() when passed unsanitized values derived from location.hash, location.search, or postMessage data. Adobe has not published the exact vulnerable component in the public advisory.

Attack Vector

An authenticated attacker with low privileges crafts a URL or webpage containing malicious payload data. When a victim visits the crafted page, client-side AEM JavaScript parses the attacker-controlled input from the DOM and passes it to an execution sink. The injected script then runs within the victim's AEM session context, inheriting the victim's permissions.

Because no verified proof-of-concept has been published and no exploit code is publicly available, this section describes the exploitation mechanism in prose only. Refer to the Adobe Security Advisory APSB26-74 for vendor guidance.

Detection Methods for CVE-2026-48260

Indicators of Compromise

Unusual URL fragments or query strings containing JavaScript keywords such as <script>, javascript:, onerror=, or encoded variants targeting AEM endpoints.
Outbound requests from user browsers to attacker-controlled domains immediately after loading AEM pages.
Unexpected DOM modifications or script injections logged in browser telemetry or Content Security Policy (CSP) reports.

Detection Strategies

Enable and monitor CSP violation reports for AEM origins to catch inline script execution attempts.
Inspect web server access logs for AEM URLs containing suspicious payloads in query parameters or URL fragments.
Deploy web application firewall (WAF) rules that flag XSS payload patterns targeting AEM endpoints.

Monitoring Recommendations

Correlate authentication events with anomalous session behavior such as unexpected API calls from AEM authoring or publishing interfaces.
Monitor endpoint telemetry for browser processes initiating unusual network connections after visiting AEM URLs.
Track referrer patterns for AEM sessions to identify redirects originating from crafted external pages.

How to Mitigate CVE-2026-48260

Immediate Actions Required

Apply the security update referenced in Adobe Security Advisory APSB26-74 to all AEM Cloud Service, AEM 6.5 LTS, SP1, and SP2 deployments.
Audit AEM user accounts and revoke unnecessary low-privilege access that could be leveraged in chained attacks.
Enforce a strict Content Security Policy on AEM-delivered content to limit inline script execution and restrict script sources.

Patch Information

Adobe has published fixes in Adobe Security Advisory APSB26-74. Administrators running AEM Cloud Service should ensure the latest release is deployed. On-premises AEM 6.5 LTS customers should install the service pack or hotfix listed in the advisory.

Workarounds

Deploy WAF rules to block requests containing common XSS payload patterns targeting AEM URLs until patching is complete.
Configure Content Security Policy headers to disallow unsafe-inline scripts and restrict script execution to trusted origins.
Instruct AEM authors and administrators to avoid clicking untrusted links while authenticated to AEM environments.

bash

# Example Content Security Policy header for AEM responses
Content-Security-Policy: default-src 'self'; \
  script-src 'self' https://trusted-cdn.example.com; \
  object-src 'none'; \
  base-uri 'self'; \
  report-uri /csp-report-endpoint