Secure AEM Instances Against Critical Code Execution Flaw CVE-2026-106626

Adobe Experience Manager contains a serious security flaw that allows attackers with high privileges to run unauthorized code on your servers. This vulnerability does not require any action from the user to exploit, meaning an attacker can trigger it silently. The issue stems from improper input validation, a common weakness where software fails to check incoming data correctly. According to the National Vulnerability Database, this flaw is rated critical with a CVSS score of 9.1.

In plain English

Think of input validation as a bouncer checking IDs at a club. If the bouncer is negligent, anyone can walk in, regardless of their credentials. In this case, the software accepts data without proper checks. An attacker with high-level access can send malicious data that the system processes as valid instructions. This allows the attacker to execute arbitrary code, effectively taking control of the application within the context of the current user. No user interaction is needed to start this process.

The background

The vulnerability is identified as CVE-2026-106626 and is linked to CWE-20, which stands for Improper Input Validation. It affects multiple versions of Adobe Experience Manager. According to the NVD record, Adobe Experience Manager as a Cloud Service is affected in versions up to 2026.9.28187. This includes the cloud-based deployment option that many enterprises use for digital experience management. The scope of the vulnerability is described as changed, indicating potential shifts in how the attack surface is evaluated.

For on-premise installations, the risk extends to older versions. Adobe Experience Manager 6.5 is vulnerable in versions up to 6.5.25. Additionally, the long-term support branch, Adobe Experience Manager 6.5 LTS, is affected in versions up to 6.5 LTS SP3. These versions are widely used in organizations that maintain control over their infrastructure. The lack of user interaction required for exploitation makes this issue particularly dangerous for systems exposed to the internet or internal networks with privileged accounts.

What changes now

System administrators must immediately audit their environments to determine if they are running affected versions. The critical rating and the ease of exploitation mean that any unpatched instance is at significant risk. Organizations using the cloud service version up to 2026.9.28187 should verify their current deployment status. For on-premise users, checking whether they are on AEM 6.5 up to 6.5.25 or 6.5 LTS up to SP3 is essential. Until a fix is confirmed and applied, the risk of arbitrary code execution remains high for privileged attackers.

Key terms explained

Input validation is the process of checking that data entering a system is safe and correct. Without it, malicious data can disrupt operations or grant unauthorized access. Arbitrary code execution means an attacker can run their own programs on your server, potentially stealing data or taking full control. High privileges refer to accounts with extensive permissions, such as administrators. Teams usually review access logs for unusual activity and restrict high-level accounts to trusted networks. Check whether your monitoring tools can detect unexpected code execution attempts.

What to do and how to stay safe: Adobe Experience Manager

• Verify your current Adobe Experience Manager version against the affected lists in the NVD record.
• Restrict high-privilege accounts to trusted networks and monitor for unusual activity.
• Apply the latest available updates once the vendor provides a confirmed fix.
• Review access logs for signs of unauthorized code execution attempts.

Step-by-step guide: Risk-Based Vulnerability Management: Benefits, Limits, and Reality

General security guidance from the Vector Update newsroom. It is not confirmed advice from the organisations named in this story.

Frequently asked questions

Which versions of Adobe Experience Manager are affected by CVE-2026-106626?

AEM as a Cloud Service up to 2026.9.28187, AEM 6.5 up to 6.5.25, and AEM 6.5 LTS up to 6.5 LTS SP3 are affected.

Does exploiting this vulnerability require user interaction?

No, exploitation of this issue does not require user interaction, according to the NVD description.

What is the severity rating of this vulnerability?

The vulnerability has a CVSS score of 9.1, which is rated as critical severity.