CVE-2026-75663: Bridge Out-of-Bounds Write RCE Vulnerability

CVE-2026-75663 Overview

CVE-2026-75663 is an out-of-bounds write vulnerability [CWE-787] in Adobe Bridge that enables arbitrary code execution in the context of the current user. Exploitation requires user interaction: a victim must open a malicious file crafted by an attacker. The flaw carries a local attack vector with high impact to confidentiality, integrity, and availability. Adobe documented the issue in security bulletin APSB26-148 alongside coordinated patch guidance for affected Bridge versions.

Critical Impact

Successful exploitation grants attackers code execution with the privileges of the logged-in user, enabling malware installation, credential theft, and lateral movement from a single opened file.

Affected Products

• Adobe Bridge (versions listed in Adobe Security Bulletin APSB26-148)
• Windows installations of Adobe Bridge
• macOS installations of Adobe Bridge

Discovery Timeline

• 2026-09-22 - CVE-2026-75663 published to the National Vulnerability Database
• 2026-09-23 - Last updated in NVD database

Technical Details for CVE-2026-75663

Vulnerability Analysis

Adobe Bridge parses a wide range of media and metadata file formats to generate previews and asset catalogs. The vulnerability occurs when Bridge processes a malformed file and writes data past the end of an allocated buffer. This out-of-bounds write [CWE-787] corrupts adjacent memory structures the parser relies on for control flow.

An attacker who controls the corrupted memory region can overwrite function pointers, virtual table entries, or return addresses. The result is arbitrary code execution inside the Bridge process. Because Bridge runs with the invoking user's privileges, the attacker inherits access to that user's files, tokens, and network resources.

The vulnerability is not remotely reachable without user interaction. The attack chain typically begins with social engineering: phishing email, drive-by download, or a shared asset library containing the weaponized file.

Root Cause

The root cause is missing or incorrect bounds validation during file parsing. Bridge trusts size fields or offsets embedded in the input file and writes to a fixed or under-allocated buffer. Adobe's advisory APSB26-148 acknowledges the defect and ships corrected parsing logic in the patched builds.

Attack Vector

Exploitation requires the victim to open a crafted file inside Adobe Bridge. The attacker delivers the file through email attachments, cloud storage shares, or compromised design asset repositories. Once opened, the malformed structure triggers the out-of-bounds write and hands control to attacker-supplied shellcode. No network privileges or authentication are required on the target host.

No public proof-of-concept or in-the-wild exploitation has been documented as of publication. See the Adobe Security Advisory APSB26-148 for technical details.

Detection Methods for CVE-2026-75663

Indicators of Compromise

• Unexpected child processes spawned by Bridge.exe or the macOS Bridge binary, particularly cmd.exe, powershell.exe, bash, or scripting interpreters.
• Bridge process crashes or Windows Error Reporting entries referencing access violations during file open operations.
• Outbound network connections initiated by the Bridge process to previously unseen domains or IP addresses shortly after a file is opened.
• Files with unusual or mismatched extensions arriving through email, chat, or shared asset libraries and referencing Bridge-supported formats.

Detection Strategies

• Monitor for anomalous process lineage where Bridge spawns command interpreters, LOLBins, or persistence utilities such as schtasks.exe and reg.exe.
• Alert on memory protection violations and DEP/ASLR-related exceptions raised by the Bridge process.
• Correlate file open events in Bridge with subsequent file writes to startup, AppData, or LaunchAgents directories.

Monitoring Recommendations

• Ingest endpoint process, file, and network telemetry into a centralized data lake to enable retrospective hunting for Bridge-initiated activity.
• Track Bridge version inventory across managed workstations to identify unpatched hosts.
• Review email and collaboration gateway logs for delivery of Bridge-supported file formats from external senders.

How to Mitigate CVE-2026-75663

Immediate Actions Required

• Apply the Adobe Bridge security update referenced in Adobe Security Advisory APSB26-148 on all Windows and macOS endpoints.
• Restrict Bridge to standard user accounts and remove local administrator rights from designers and content creators.
• Instruct users to avoid opening Bridge-supported files received from untrusted sources until patching is complete.
• Verify endpoint protection is running and configured to block child-process execution from Bridge.

Patch Information

Adobe released fixed versions of Bridge as documented in security bulletin APSB26-148. Administrators should deploy the vendor-supplied installer or use the Adobe Creative Cloud desktop client to update Bridge to the patched build. Confirm the update by checking the installed version in the Bridge About dialog against the version numbers listed in the advisory.

Workarounds

• Block or quarantine inbound files with Bridge-associated extensions at the email gateway when the sender is external and unverified.
• Change default file associations so Bridge-supported formats do not open in Bridge automatically on double-click.
• Apply application allowlisting rules that prevent Bridge from launching child processes such as shells and script interpreters.

# Windows: verify installed Adobe Bridge version against APSB26-148 fixed builds
Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*" `
  | Where-Object { $_.DisplayName -like "*Adobe Bridge*" } `
  | Select-Object DisplayName, DisplayVersion, InstallDate