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CVE-2026-21308: Medium Vulnerability in Adobe Substance3D

Adobe Substance3D - Designer versions 15.0.3 and earlier are affected by an Out-of-bounds Read vulnerability. This could lead to memory exposure, requiring user interaction to exploit. Organizations should prioritize patching immediately.

MEDIUMCVSS 5.5 · Published January 13, 2026

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Adobe Substance3D - Designer versions 15.0.3 and earlier are affected by an Out-of-bounds Read vulnerability that could lead to memory exposure. This vulnerability allows attackers to disclose sensitive information stored in memory. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

With a CVSS score of 5.5, this vulnerability is classified as medium severity. The potential impact on confidentiality is high, as sensitive information could be exposed through this vulnerability. Organizations must understand the risk this poses and take action to mitigate it.

The exploitation status indicates that there are currently no known exploits or proof-of-concept (PoC) available. However, the fact that user interaction is required for exploitation does not lessen the urgency for defenders to address this vulnerability promptly.

Organizations should prioritize patching immediately. Ensuring that systems are updated to versions that are not affected by this vulnerability is critical in maintaining security posture.

Vulnerability Details

The vulnerability in question involves an Out-of-bounds Read, classified under CWE-125, affecting Adobe Substance3D - Designer. The affected versions are 15.0.3 and earlier. As per the CVSS metrics, the attack vector is local, and it requires low complexity with no privileges required, but it does necessitate user interaction.

The attack complexity is low, meaning that an attacker can easily exploit this vulnerability if the user opens a malicious file. The potential impact on confidentiality is high, as sensitive data could be exposed, while integrity and availability impacts are noted to be none.

Technical Analysis

The root cause of this vulnerability lies in improper handling of memory accesses, which can lead to memory exposure. The attack vector is local, requiring the attacker to have physical or logical access to the victim's machine to exploit the vulnerability. The complexity of the attack is low, indicating that it can be performed with minimal effort.

As there are no privileges required for exploitation, it becomes a significant concern, especially since user interaction is a prerequisite. The confidentiality impact is high, as sensitive information stored in memory could be disclosed, while there are no impacts on integrity or availability.

Risk & Impact Analysis

Risk to organizations includes the potential exposure of sensitive information, which could lead to data breaches and compliance issues. The vulnerability's nature requires user interaction, which may limit its exploitability, but it still poses a significant risk if exploited.

Given the high confidentiality impact and medium severity rating, organizations should assess the potential blast radius and prioritize remediation efforts accordingly. The urgency of addressing this vulnerability is underscored by its classification and the potential consequences of exploitation.

Exploitation Status

Signal

Status

Known Exploit

No

Public PoC

No

Actively Exploited

No

Ransomware Use

No

Affected Versions

The affected versions include Adobe Substance3D - Designer versions 15.0.3 and earlier. Organizations should ensure that they update to version 15.1.0 or later to mitigate this vulnerability.

Mitigation & Remediation

Adobe has released a patch to address this vulnerability, and organizations are encouraged to apply this update promptly. The recommended version to upgrade to is 15.1.0 or later. If immediate patching is not feasible, consider implementing configuration hardening measures to limit exposure.

Organizations should also enhance their monitoring capabilities to detect any suspicious activity related to file openings or interactions with Adobe Substance3D - Designer. Regular assessments and security testing should be part of the ongoing security strategy.

For more information on penetration testing services, organizations may refer to penetration testing to validate the security posture.

Detection Guidance

Organizations should monitor logs for indicators of abnormal file access or attempts to open potentially malicious files. Behavioral anomalies related to the use of Adobe Substance3D - Designer should be assessed regularly to identify any signs of exploitation.

Network signatures related to file access and file types associated with Adobe products can be useful in detecting suspicious activity. Additionally, changes in user behavior regarding file handling should be closely monitored.

AppSecure Threat Intelligence Insight

This vulnerability highlights the ongoing challenges organizations face with memory-related vulnerabilities and the importance of user education regarding file handling.

As organizations adopt more sophisticated software, they must recognize the potential for vulnerabilities that require user interaction for exploitation, reinforcing the need for continuous security awareness training.

For further reading on vulnerability management practices, organizations may consider reviewing resources on vulnerability management programs. Understanding the landscape of vulnerabilities and trends can also be beneficial, as seen in reports on vulnerability exposure and the importance of proactive security measures.

Lastly, organizations should stay updated on security practices, including best practices in penetration testing to continuously assess their security posture against emerging threats.

Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.

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