CVE-2026-27299: Adobe FrameMaker Information Disclosure

CVE-2026-27299 Overview

Adobe Framemaker versions 2022.8 and earlier are affected by an Improper Input Validation vulnerability that could lead to arbitrary file system read. An attacker could leverage this vulnerability to access sensitive files or data on the system. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

Critical Impact

This vulnerability enables unauthorized access to sensitive files on the target system, potentially exposing confidential data, credentials, or system configuration files when a user opens a crafted malicious document.

Affected Products

• Adobe Framemaker versions 2022.8 and earlier
• Microsoft Windows (as the underlying operating system platform)

Discovery Timeline

• April 14, 2026 - CVE-2026-27299 published to NVD
• April 15, 2026 - Last updated in NVD database

Technical Details for CVE-2026-27299

Vulnerability Analysis

This vulnerability is classified as CWE-20 (Improper Input Validation) and allows an attacker to achieve arbitrary file system read access. The flaw exists in how Adobe Framemaker processes input within document files, failing to properly validate or sanitize user-controlled data before using it to access file system resources.

When a user opens a specially crafted malicious Framemaker document, the application improperly processes embedded references or paths without adequate validation. This allows the attacker-controlled input to specify arbitrary file paths on the system, resulting in unauthorized read access to files outside the intended scope.

The attack requires local access and user interaction—specifically, the victim must be convinced to open a malicious .fm or related Framemaker document file. Upon opening, the vulnerability is triggered, potentially allowing exfiltration of sensitive data including configuration files, credentials, or other confidential information stored on the local file system.

Root Cause

The root cause of CVE-2026-27299 is insufficient input validation in Adobe Framemaker's file parsing routines. The application fails to properly sanitize or restrict file path references embedded within Framemaker documents, allowing path traversal or arbitrary file access patterns to be processed without adequate security checks.

Attack Vector

The attack vector is local, requiring user interaction. An attacker must craft a malicious Framemaker document containing specially constructed input that exploits the improper validation flaw. The attack scenario typically involves:

1. Attacker creates a malicious Framemaker document with embedded file references designed to access sensitive files
2. Attacker delivers the malicious document to the victim via email, file sharing, or other social engineering methods
3. Victim opens the malicious document in Adobe Framemaker
4. The vulnerability is triggered, allowing the application to read arbitrary files from the victim's system
5. Sensitive file contents may be exposed or exfiltrated depending on the specific exploitation technique

The vulnerability has a changed scope, meaning the security impact extends beyond the vulnerable component to affect the underlying operating system's file confidentiality.

Detection Methods for CVE-2026-27299

Indicators of Compromise

• Unexpected file access attempts by the FrameMaker.exe process to sensitive system directories or files outside normal working paths
• Adobe Framemaker attempting to read files from system directories such as C:\Windows\System32\ or user profile locations containing credentials
• Unusual network activity following the opening of Framemaker documents, potentially indicating data exfiltration attempts
• Presence of suspicious .fm files received via email or downloaded from untrusted sources

Detection Strategies

• Monitor file system access patterns for FrameMaker.exe and related Adobe processes, alerting on access to sensitive file locations
• Implement endpoint detection rules to identify path traversal patterns or attempts to access files outside the application's normal working directories
• Deploy email gateway filtering to scan incoming Framemaker documents for potentially malicious content
• Utilize SentinelOne's behavioral AI to detect anomalous file access patterns that deviate from normal application behavior

Monitoring Recommendations

• Enable detailed file access auditing for sensitive directories and files on systems running Adobe Framemaker
• Configure SentinelOne to alert on suspicious document-based attack patterns and file system enumeration activities
• Implement application whitelisting policies to restrict which file paths Adobe Framemaker can access
• Review security logs for any attempts by Adobe processes to access configuration files, credential stores, or sensitive user data

How to Mitigate CVE-2026-27299

Immediate Actions Required

• Update Adobe Framemaker to the latest patched version as referenced in the Adobe Security Advisory APSB26-36
• Warn users not to open Framemaker documents from untrusted or unknown sources
• Implement SentinelOne endpoint protection to detect and block exploitation attempts
• Review recent Framemaker document activity for any suspicious files that may have been opened

Patch Information

Adobe has released a security update addressing this vulnerability. Organizations should apply the update referenced in the Adobe Security Advisory APSB26-36. The patch addresses the improper input validation flaw by implementing proper sanitization and validation of file path references within Framemaker documents.

It is strongly recommended to update Adobe Framemaker beyond version 2022.8 to a patched release that addresses CVE-2026-27299.

Workarounds

• Restrict opening Framemaker documents to only those from trusted, verified sources until the patch can be applied
• Implement application sandboxing to limit Adobe Framemaker's access to the file system
• Configure endpoint security solutions to monitor and restrict file system access by Adobe applications
• Consider temporarily disabling Adobe Framemaker on high-value systems until patching is complete
• Use network segmentation to limit potential data exfiltration if exploitation occurs

# Example: Restrict Framemaker from accessing sensitive directories using Windows Defender Application Control
# Note: Consult Adobe documentation for supported configuration options
# Ensure users only open documents from trusted network locations
# Review and apply Adobe security updates from:
# https://helpx.adobe.com/security/products/framemaker/apsb26-36.html