CVE-2026-75646 Overview
Adobe Experience Manager (AEM) contains a DOM-based Cross-Site Scripting (XSS) vulnerability tracked as CVE-2026-75646. An attacker can manipulate the Document Object Model (DOM) to execute arbitrary JavaScript in the victim's browser session. Exploitation requires a low-privileged authenticated attacker and user interaction, specifically the victim visiting a crafted webpage. The vulnerability carries a changed scope, meaning impact extends beyond the vulnerable component to affect other browser contexts. Adobe published Security Advisory APSB26-98 to address the issue. The flaw is classified under [CWE-79], Improper Neutralization of Input During Web Page Generation.
Critical Impact
Successful exploitation enables execution of malicious JavaScript in the victim's browser, potentially leading to session token theft, unauthorized content modification, and account takeover within AEM environments.
Affected Products
- Adobe Experience Manager (AEM) - see Adobe Security Advisory APSB26-98 for affected versions
- Adobe Experience Manager Cloud Service
- Adobe Experience Manager on-premises deployments
Discovery Timeline
- 2026-09-08 - CVE CVE-2026-75646 published to NVD
- 2026-09-08 - Last updated in NVD database
Technical Details for CVE-2026-75646
Vulnerability Analysis
CVE-2026-75646 is a DOM-based XSS vulnerability in Adobe Experience Manager. Unlike reflected or stored XSS, DOM-based XSS executes entirely within the client-side browser environment. The vulnerability arises when JavaScript in an AEM page reads attacker-influenced data from a DOM source and passes it to a dangerous sink without sanitization.
An authenticated attacker with low privileges can craft a URL or webpage that manipulates the DOM environment of a victim's AEM session. When the victim interacts with the crafted content, malicious JavaScript executes in the context of the AEM origin. The changed scope indicates the vulnerable component's impact crosses trust boundaries, affecting resources beyond the initial vulnerable page.
Root Cause
The vulnerability stems from improper neutralization of user-controlled input written to the DOM. Client-side JavaScript in AEM processes data from sources such as document.location, document.URL, or window.name and passes it to sinks like innerHTML, document.write, or eval without adequate encoding or validation. This allows attacker-supplied script fragments to be interpreted as executable code by the browser.
Attack Vector
The attack requires network access to a vulnerable AEM instance, low-privileged authentication, and victim interaction. An attacker constructs a URL containing a malicious payload in a location the client-side script reads, then delivers the URL through phishing, malicious links, or embedded iframes. When the authenticated victim visits the crafted page, the payload executes in their browser under the AEM domain's context. The attacker can then exfiltrate session tokens, perform actions as the victim, or pivot to further attacks against the AEM platform.
No public proof-of-concept exploit is available at the time of publication. Refer to the Adobe Security Advisory APSB26-98 for vendor-provided technical detail.
Detection Methods for CVE-2026-75646
Indicators of Compromise
- Unexpected outbound requests from authenticated AEM user browsers to attacker-controlled domains, indicating potential token or cookie exfiltration.
- AEM access logs showing unusual URL parameters containing encoded script fragments such as <script>, javascript:, or onerror=.
- Anomalous authenticated actions performed by AEM users shortly after they clicked externally referred links.
Detection Strategies
- Deploy Content Security Policy (CSP) reporting to capture inline script violations and unauthorized script sources within AEM.
- Inspect HTTP referrer patterns for AEM sessions originating from external phishing infrastructure.
- Correlate authentication events with subsequent administrative or content-modification actions to identify hijacked sessions.
Monitoring Recommendations
- Enable verbose logging on AEM Dispatcher and origin servers to record full request URIs and query parameters for forensic review.
- Monitor browser telemetry and endpoint logs for JavaScript execution anomalies in AEM author and publish instances.
- Alert on repeated 4xx responses from AEM endpoints that receive script-like input, indicating probing activity.
How to Mitigate CVE-2026-75646
Immediate Actions Required
- Apply the security update referenced in Adobe Security Advisory APSB26-98 as soon as feasible.
- Inventory all AEM Author, Publish, and Dispatcher instances and confirm patch coverage across the environment.
- Rotate session tokens and require re-authentication for privileged AEM users following patch deployment.
Patch Information
Adobe released fixes for this vulnerability in the security bulletin APSB26-98. Consult the Adobe Security Advisory APSB26-98 for the exact affected versions, remediated builds, and platform-specific installation instructions covering both AEM Cloud Service and on-premises deployments.
Workarounds
- Implement a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins.
- Configure AEM Dispatcher rules to filter suspicious query parameters and fragment identifiers containing script syntax.
- Educate content authors and administrators to avoid clicking untrusted links while authenticated to AEM.
- Restrict AEM Author instance access to trusted networks using VPN or IP allowlisting until patching is complete.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.