CVE-2026-48252: Adobe Experience Manager Auth Bypass Flaw

CVE-2026-48252 Overview

CVE-2026-48252 is a Missing Authentication for Critical Function vulnerability [CWE-306] affecting Adobe Experience Manager (AEM). The flaw allows unauthenticated attackers to bypass security controls and obtain unauthorized write access to affected instances. Exploitation requires no user interaction and can be triggered remotely over the network. Because the scope is changed, a successful attack impacts resources beyond the vulnerable component itself.

Adobe published security advisory APSB26-74 to address the issue across supported AEM releases, including AEM Cloud Service and AEM 6.5 LTS service packs.

Critical Impact
Unauthenticated attackers can write to protected resources in Adobe Experience Manager, enabling content tampering, defacement, or staging of further attacks against downstream systems.

Affected Products

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

Discovery Timeline

2026-07-14 - CVE-2026-48252 published to the National Vulnerability Database
2026-07-17 - Last updated in NVD database

Technical Details for CVE-2026-48252

Vulnerability Analysis

CVE-2026-48252 stems from a critical function in Adobe Experience Manager that does not enforce authentication before executing a state-changing operation. An attacker sending a crafted network request can invoke this function directly and modify resources without presenting valid credentials. The vulnerability affects integrity but does not directly disclose data or crash the service.

Because the CVSS scope is changed, exploitation can cross security boundaries. Content written into AEM through the bypass may be served to end users, published to downstream systems, or used to introduce malicious payloads into the broader authoring pipeline. This makes the flaw useful both for direct defacement and as a foothold for supply-chain-style attacks against sites and applications backed by AEM.

Root Cause

The root cause is a missing authentication check on a function that performs privileged, write-capable operations. Under [CWE-306], the affected endpoint should require a verified identity before accepting the request, but it accepts anonymous input and executes the operation as if the caller were authorized. No credentials, tokens, or session context are validated on the request path.

Attack Vector

The vulnerability is exploitable over the network with low attack complexity, no privileges, and no user interaction. An attacker only needs network reachability to the AEM instance, typically the author or publish tier exposed through HTTP or HTTPS. The attacker issues a request to the unauthenticated critical function and receives write access to the targeted resource.

No public proof-of-concept exploit is currently listed for CVE-2026-48252, and CISA has not added it to the Known Exploited Vulnerabilities catalog. Refer to the Adobe Security Advisory APSB26-74 for vendor technical details.

Detection Methods for CVE-2026-48252

Indicators of Compromise

Unexpected POST, PUT, or DELETE requests to AEM endpoints from clients without prior authentication events in access logs.
New or modified JCR nodes, content packages, or configurations authored by anonymous or unknown users.
Requests to sensitive AEM paths such as /bin/, /system/, or /libs/ that succeed without a preceding login.

Detection Strategies

Correlate web server and dispatcher logs with AEM audit logs to identify write operations lacking a corresponding authenticated session.
Baseline expected content-modification patterns for authors and publishers, then alert on deviations originating from non-author IP ranges.
Deploy web application firewall rules to flag unauthenticated requests targeting AEM management or content APIs.

Monitoring Recommendations

Forward AEM access.log, audit.log, and dispatcher logs to a centralized SIEM for correlation and long-term retention.
Monitor for outbound requests from AEM servers to unexpected destinations, which may indicate post-exploitation activity following unauthorized writes.
Alert on changes to publish-tier content outside approved change windows or workflows.

How to Mitigate CVE-2026-48252

Immediate Actions Required

Apply the Adobe security update referenced in APSB26-74 to all AEM Cloud Service and AEM 6.5 LTS environments.
Restrict network access to AEM author and publish instances so only trusted networks and reverse proxies can reach management endpoints.
Audit content repositories and configurations for unauthorized modifications since the vulnerability's disclosure window.

Patch Information

Adobe has released fixed builds for Adobe Experience Manager Cloud Service and Adobe Experience Manager 6.5 LTS. Administrators should upgrade to the versions listed in Adobe Security Advisory APSB26-74. AEM Cloud Service customers receive updates through Adobe's managed release channel, while on-premises AEM 6.5 LTS customers must apply the corresponding service pack or cumulative fix pack.

Workarounds

Block or filter access to the affected endpoints at the AEM Dispatcher or upstream reverse proxy until the patch is applied.
Enforce strict allowlists on the dispatcher filter.any configuration to deny anonymous access to write-capable paths.
Place AEM author instances behind a VPN or zero-trust access broker to remove direct internet exposure.

bash

# Example AEM Dispatcher filter to deny anonymous write methods
/0100 { /type "deny" /method '(POST|PUT|DELETE)' /url "*" }
/0101 { /type "allow" /method '(POST|PUT|DELETE)' /url "*" /header "Authorization" }