Key points
- CVE-2026-103848 is rated 9.9 Critical by the NVD.
- Affected versions include AEM 6.5 LTS up to SP3 and 6.5 up to 6.5.25.
- Exploitation requires a low-privileged account and no user interaction.
Adobe Experience Manager 6.5 LTS through SP3 and standard versions up to 6.5.25 contain a critical OS command injection flaw, identified as CVE-2026-103848. The National Vulnerability Database rates this issue at 9.9, the highest severity level. According to the NVD, the vulnerability allows arbitrary code execution in the context of the current user. Security teams must determine if their environments fall within these version ranges, as no vendor patch has been confirmed as available.
In plain English
The flaw stems from improper neutralization of special elements used in OS commands, mapped to CWE-78. An attacker with low-privileged access can exploit this to run arbitrary code on the server. The NVD notes that exploitation does not require user interaction, meaning the attack can trigger automatically once the attacker initiates the request. The scope of the vulnerability is changed, which contributes to the high CVSS score.
The background
As Vuln Post reported on October 13, 2026, Adobe Experience Manager 6.5 faces a critical input validation flaw with a CVSS score of 9.9. That earlier report highlighted a zero-click code execution vulnerability affecting AEM 6.5 through 6.5.25. The current NVD record for CVE-2026-103848 confirms these details, specifying the weakness as OS command injection. The lack of a confirmed fix remains consistent with previous assessments.
What changes now
Organizations running the affected AEM versions face immediate risk from any low-privileged accounts that could be compromised. Since no patch is confirmed, exposure management becomes the primary control. The NVD description clarifies that the code runs in the context of the current user, limiting the initial privilege level but still allowing significant damage. Teams should verify their specific version numbers against the affected list to determine impact.
Who needs to act first
Teams should prioritize systems with public-facing endpoints or those accessible to low-privileged users. Check whether your AEM instances are exposed to the internet or internal networks where lateral movement is possible. Isolate affected servers from critical assets where feasible. Validate that logging is active to detect suspicious command execution patterns. Back up configurations and data before making any changes to the environment. Monitor for unusual process spawns or network connections that indicate exploitation attempts.
Background: Input validation
Input validation cyber security requires checking every piece of data entering a system for type, length, and format. You must reject unexpected data immediately. This prevents attackers from injecting malicious code or causing system crashes. Trusting user input without strict rules allows breaches to occur.
Read the full guide: Input Validation Cyber Security: Stop Code Injection Before It Starts
What to do and how to stay safe: Adobe Experience Manager
- Audit all Adobe Experience Manager 6.5 instances to confirm if they are version 6.5.25 or lower, or 6.5 LTS SP3 or lower.
- Restrict access to low-privileged accounts, especially those with web-facing capabilities, to reduce the attack surface.
- Monitor system logs for unexpected OS command executions or new process creations that do not match normal operational patterns.
- Implement network segmentation to limit the potential impact of code execution on other critical systems within the environment.
Step-by-step guide: 7 Configuration Errors That Expose Systems to Zero-Day Exploits
General security guidance from the Vuln Post newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
Which Adobe Experience Manager versions are affected by CVE-2026-103848?
The vulnerability affects Adobe Experience Manager 6.5 LTS up to 6.5 LTS SP3 and Adobe Experience Manager 6.5 up to 6.5.25.
Can an unauthenticated attacker exploit this flaw?
No, the source material specifies that a low-privileged attacker is required to exploit this vulnerability.
Is a patch available for this OS command injection issue?
No, the source material does not confirm the availability of a patch or fix for this vulnerability.
