CVE-2026-48259: Adobe Experience Manager SSRF Vulnerability

CVE-2026-48259 Overview

CVE-2026-48259 is a Server-Side Request Forgery (SSRF) vulnerability [CWE-918] in Adobe Experience Manager (AEM). A low-privileged attacker can issue unauthorized server-side requests that lead to arbitrary code execution in the context of the current user. The flaw affects AEM Cloud Service and AEM 6.5 LTS releases through Service Pack 2. Exploitation requires no user interaction and produces a scope change, allowing impact beyond the vulnerable component. Adobe published patches in security bulletin APSB26-74.

Critical Impact
An authenticated attacker with low privileges can trigger server-side requests that result in arbitrary code execution and elevated access to victim accounts or sessions.

Affected Products

Adobe Experience Manager (AEM) Cloud Service
Adobe Experience Manager 6.5 LTS (base release)
Adobe Experience Manager 6.5 LTS Service Pack 1 and Service Pack 2

Discovery Timeline

2026-07-14 - CVE-2026-48259 published to the National Vulnerability Database
2026-07-17 - Last updated in the NVD database

Technical Details for CVE-2026-48259

Vulnerability Analysis

The vulnerability is a Server-Side Request Forgery flaw classified under [CWE-918]. AEM accepts attacker-influenced input that determines the destination of a server-initiated request. Because the server executes that request without adequate destination validation, an attacker can coerce AEM into contacting internal services, cloud metadata endpoints, or attacker-controlled hosts. The changed scope indicates the vulnerable component can affect resources beyond its own security boundary. Chained with server-side execution primitives, the SSRF results in arbitrary code execution in the context of the current user, according to Adobe's advisory.

Root Cause

The root cause is missing or insufficient validation of request destinations processed by AEM server-side components. Input controlled by an authenticated low-privileged user reaches an HTTP client routine without allow-listing, protocol restriction, or network segmentation checks. This lets an attacker point the server at arbitrary URIs.

Attack Vector

The attack vector is network-based and requires authentication at a low privilege level. No user interaction is needed. An attacker sends a crafted request to an AEM endpoint that performs server-side fetching. The server then issues the outbound request, which the attacker leverages to reach internal resources, exfiltrate data, or trigger code execution paths available to the AEM process. Public exploit code is not currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Adobe has not released technical exploitation details. See the Adobe Experience Manager Security Advisory APSB26-74 for vendor guidance.

Detection Methods for CVE-2026-48259

Indicators of Compromise

Outbound HTTP or HTTPS requests from AEM author or publish instances to internal IP ranges, cloud metadata endpoints (169.254.169.254), or unexpected external hosts.
Anomalous authenticated requests to AEM endpoints that accept URL parameters, followed by short-interval outbound connections from the AEM JVM process.
Unexpected child processes spawned by the AEM Java process, indicating potential code execution.

Detection Strategies

Review AEM request.log and access.log for POST or GET requests containing URL-typed parameters from low-privileged accounts.
Correlate authentication events with outbound network flows originating from AEM server hosts to identify SSRF probing.
Baseline expected outbound destinations from AEM instances and alert on deviations, especially to RFC1918 addresses and cloud metadata services.

Monitoring Recommendations

Enable egress filtering logs on network devices in front of AEM and forward them to a centralized analytics platform.
Monitor Java process behavior on AEM hosts for new process creation, file writes to web-accessible directories, and unusual outbound sockets.
Track failed and successful logins for AEM low-privileged roles that immediately precede unusual server-initiated requests.

How to Mitigate CVE-2026-48259

Immediate Actions Required

Apply the updates listed in Adobe security bulletin APSB26-74 to all AEM Cloud Service tenants and AEM 6.5 LTS deployments (base, SP1, SP2).
Audit AEM user accounts and remove or restrict low-privileged accounts that are not required.
Restrict outbound network access from AEM instances to only the destinations required for business operations.

Patch Information

Adobe released fixes referenced in APSB26-74. AEM Cloud Service customers receive updates through the managed service pipeline. AEM 6.5 LTS customers must upgrade to the fixed service pack version identified in the advisory.

Workarounds

Block AEM outbound access to cloud metadata endpoints such as 169.254.169.254 at the network layer.
Place AEM author instances behind a reverse proxy that enforces an allow-list of outbound destinations for server-initiated fetches.
Disable or restrict AEM features and components that perform server-side URL fetching if they are not required in your deployment.

bash

# Example egress restriction using iptables on an AEM host
# Block access to cloud instance metadata service
iptables -A OUTPUT -d 169.254.169.254 -j DROP

# Allow only specific external hosts for legitimate integrations
iptables -A OUTPUT -p tcp -d trusted.example.com --dport 443 -j ACCEPT
iptables -A OUTPUT -p tcp --dport 443 -j DROP