CVE-2025-54251: Adobe Experience Manager Auth Bypass Flaw

CVE-2025-54251 Overview

Adobe Experience Manager (AEM) versions 6.5.23.0 and earlier contain an XML Injection vulnerability tracked as CVE-2025-54251. The flaw allows a low-privileged authenticated attacker to manipulate XML queries processed by the application. Successful exploitation results in a security feature bypass and limited unauthorized write access to application data.

The vulnerability is classified under CWE-91: XML Injection and affects both on-premises AEM 6.5 LTS deployments and AEM Cloud Service. Adobe addressed the issue in security advisory APSB25-90.

Critical Impact
An authenticated attacker with low privileges can inject crafted XML content to bypass security controls and perform limited write operations against affected AEM instances over the network.

Affected Products

Adobe Experience Manager 6.5.23.0 and earlier (on-premises)
Adobe Experience Manager 6.5 LTS (including SP1)
Adobe Experience Manager Cloud Service (AEM as a Cloud Service)

Discovery Timeline

2025-09-09 - CVE CVE-2025-54251 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-54251

Vulnerability Analysis

The vulnerability resides in how Adobe Experience Manager parses and processes XML input supplied through authenticated request paths. The application fails to properly neutralize special elements within XML data before incorporating that data into downstream XML queries. An attacker who holds a low-privileged account can submit crafted XML payloads that alter the structure or semantics of those queries.

The resulting behavior allows the attacker to bypass security controls that depend on the integrity of XML query logic. According to Adobe's advisory, the impact is limited to unauthorized write access rather than full data compromise or code execution. The flaw does not require user interaction and can be exploited remotely over the network against exposed AEM endpoints.

Root Cause

The root cause is insufficient input validation and sanitization of XML content handled by AEM's request processing layer, consistent with CWE-91. When untrusted XML fragments are concatenated into or interpreted as part of a larger XML query, injected markup is treated as structural syntax rather than inert data.

Attack Vector

Exploitation requires network access to an AEM author or publish instance and a valid low-privileged account. The attacker submits a request containing crafted XML content targeting a vulnerable handler. The malicious XML modifies the query that AEM constructs, enabling the attacker to influence operations that would otherwise be restricted by the application's access logic. No victim interaction is required.

No public proof-of-concept exploit, Exploit-DB entry, or CISA KEV listing exists for CVE-2025-54251 at the time of writing.

Detection Methods for CVE-2025-54251

Indicators of Compromise

Requests to AEM endpoints containing XML payloads with embedded angle brackets, CDATA sections, or XPath/XQuery metacharacters in parameters that normally carry simple values.
Unexpected write operations (node creation, property modification) in the JCR repository performed by low-privileged service or author accounts.
Error entries in error.log referencing XML parsing failures, malformed query syntax, or unexpected XPath expressions.
Access log entries from low-privileged users targeting query, search, or form-handling servlets at unusual rates.

Detection Strategies

Enable verbose request logging on AEM dispatcher and application tiers and alert on payloads whose body or query parameters contain raw XML control characters where structured values are expected.
Correlate authentication events for low-privileged accounts with subsequent write operations against the JCR to flag privilege-boundary violations.
Deploy a web application firewall rule set that inspects request bodies for XML injection patterns targeting known AEM servlet paths.

Monitoring Recommendations

Forward AEM request.log, error.log, and audit logs to a centralized SIEM for retention and correlation.
Baseline normal query and write volumes per user role, then alert on deviations tied to accounts without content authoring privileges.
Monitor Adobe's security bulletin feed for updates to APSB25-90 and related advisories.

How to Mitigate CVE-2025-54251

Immediate Actions Required

Inventory all AEM instances and identify any running version 6.5.23.0 or earlier, including AEM 6.5 LTS and AEM Cloud Service tenants.
Apply the patches referenced in Adobe Security Advisory APSB25-90 as soon as change windows permit.
Review account inventories and remove or disable unused low-privileged accounts that could be abused to reach the vulnerable code paths.
Restrict network exposure of AEM author instances to trusted administrative networks or VPN segments.

Patch Information

Adobe released fixed versions as part of the September 2025 Experience Manager update cycle. Administrators should install the AEM 6.5 Service Pack identified in APSB25-90. AEM as a Cloud Service customers receive the fix through Adobe's managed release pipeline and should confirm their tenant is running a current release build.

Workarounds

Place a web application firewall or AEM dispatcher rule in front of exposed instances to reject requests whose parameters contain unexpected XML syntax.
Enforce least-privilege permissions on AEM user groups so that low-privileged accounts cannot reach handlers that construct XML queries.
Disable or restrict any unused servlets, components, or endpoints that accept XML input from authenticated users.

bash

# Example AEM dispatcher filter rule to deny suspicious XML-bearing requests
# Place in /etc/httpd/conf.d/dispatcher.d/filters/custom_filters.any
/0100 { /type "deny" /url "*" /query "*<*" }
/0101 { /type "deny" /url "*" /query "*CDATA*" }