CVE-2026-48288: Adobe Experience Manager Auth Bypass Flaw

CVE-2026-48288 Overview

CVE-2026-48288 affects Adobe Experience Manager (AEM) versions 6.5.24, LTS SP1, 2026.04, and earlier. The vulnerability stems from improper input validation [CWE-20] that enables a security feature bypass. A low-privileged attacker can leverage this flaw to circumvent security controls and gain unauthorized write access to the application.

Exploitation requires user interaction. A victim must visit a maliciously crafted URL or interact with a compromised web page for the attack chain to succeed. Adobe published advisory APSB26-56 to address this issue.

Critical Impact
Low-privileged attackers can bypass security controls in Adobe Experience Manager and obtain unauthorized write access when an authenticated user interacts with a malicious URL.

Affected Products

Adobe Experience Manager 6.5.24 and earlier
Adobe Experience Manager LTS SP1
Adobe Experience Manager 2026.04 and earlier (including AEM Cloud Service)

Discovery Timeline

2026-06-09 - CVE-2026-48288 published to NVD
2026-06-10 - Last updated in NVD database

Technical Details for CVE-2026-48288

Vulnerability Analysis

The vulnerability is classified as Improper Input Validation [CWE-20] within Adobe Experience Manager. AEM fails to properly validate input received through a network-facing component, allowing an authenticated attacker with low privileges to bypass an intended security restriction.

The flaw permits unauthorized write operations against resources that should be protected. While the confidentiality impact is none and availability is unaffected, the integrity impact is limited but real. The vulnerability requires both low-level authentication and user interaction, which constrains mass-exploitation scenarios.

At the time of publication, no public proof-of-concept exploit exists. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Root Cause

The root cause is missing or insufficient validation of attacker-controlled input within an AEM request handler. The application accepts crafted input that should be rejected by its security feature. This permits actions the security control was designed to prevent, including unauthorized write access.

Attack Vector

The attack vector is network-based. An attacker with low-privileged AEM credentials crafts a malicious URL or web page. When an authenticated user visits the URL or interacts with the compromised page, the request executes in the user's session and bypasses the targeted security feature.

No verified exploit code is publicly available. Refer to the Adobe Security Advisory APSB26-56 for vendor-supplied technical details.

Detection Methods for CVE-2026-48288

Indicators of Compromise

Unexpected write operations or content modifications in AEM repositories performed by low-privileged accounts.
HTTP requests to AEM containing unusual or malformed parameters originating from external referrers.
Authenticated session activity immediately following user interaction with externally crafted URLs targeting AEM endpoints.

Detection Strategies

Review AEM access.log and request.log for anomalous POST, PUT, or Sling-based write requests from accounts that do not typically perform authoring actions.
Correlate web proxy and email gateway logs for delivery of suspicious URLs referencing AEM hostnames or author/publish instances.
Baseline normal authoring behavior and alert on deviations such as off-hours writes or modifications from previously unused IP ranges.

Monitoring Recommendations

Forward AEM dispatcher, author, and publish logs to a centralized SIEM for retention and correlation.
Monitor for repeated 4xx and 5xx responses on AEM endpoints that may indicate exploitation attempts.
Track changes to JCR nodes and content paths through audit logging and alert on unauthorized modifications.

How to Mitigate CVE-2026-48288

Immediate Actions Required

Apply the security updates referenced in Adobe Security Advisory APSB26-56 to all affected AEM instances.
Inventory AEM deployments to confirm versions and prioritize patching of internet-facing author and publish instances.
Audit low-privileged AEM accounts and disable or rotate credentials for any accounts no longer required.

Patch Information

Adobe addressed CVE-2026-48288 in security advisory APSB26-56. Customers running AEM 6.5.24, LTS SP1, 2026.04, or earlier should upgrade to the fixed releases identified in the advisory. AEM as a Cloud Service customers receive the fix through the standard cloud update cycle.

Workarounds

Restrict access to AEM author instances behind VPN or IP allow-lists to limit exposure of low-privileged endpoints.
Enforce strict dispatcher filter rules to block unexpected request parameters and methods reaching the publish tier.
Train content authors and administrators to avoid clicking unsolicited links that reference internal AEM URLs.

bash

# Example dispatcher filter hardening - restrict methods and parameters
/filter {
  /0001 { /type "deny"  /url "*" }
  /0010 { /type "allow" /method "GET" /url "*" }
  /0020 { /type "allow" /method "POST" /path "/content/*" }
  # Deny unexpected selectors and suffixes that may carry crafted input
  /0100 { /type "deny" /selectors '.*\..*' /extension '(json|xml)' }
}