CVE-2026-35076 Overview
CVE-2026-35076 is a high-severity arbitrary file deletion vulnerability affecting the bac-scanresult method. The flaw stems from insufficient validation of user-controlled input passed to the method. A remote attacker holding low-privilege user credentials can delete arbitrary local files on the affected system. The weakness is classified as [CWE-73]: External Control of File Name or Path. Because file deletion targets are attacker-controlled, the issue threatens both system integrity and availability. CERT-VDE published advisory VDE-2026-039 describing the issue. No public exploit code, proof-of-concept, or in-the-wild exploitation has been reported at this time.
Critical Impact
Authenticated remote attackers can delete arbitrary files on the target host, enabling tampering with application state, removal of audit logs, or disruption of system services.
Affected Products
- Products implementing the bac-scanresult method as documented in CERT-VDE advisory VDE-2026-039
- Refer to the CERT-VDE Security Advisory for the authoritative list of affected versions
Discovery Timeline
- 2026-06-03 - CVE-2026-35076 published to NVD
- 2026-06-03 - Last updated in NVD database
Technical Details for CVE-2026-35076
Vulnerability Analysis
The bac-scanresult method exposes file deletion functionality to authenticated users without enforcing strict validation on the supplied file path parameter. An attacker authenticated as a low-privilege user can submit a crafted request containing an arbitrary absolute path or a relative path containing traversal sequences such as ../. The application then processes the request and deletes the targeted file from the local filesystem. Because the deletion occurs under the privileges of the service account hosting the method, attackers can remove files that they could not otherwise access through the standard user interface. The impact extends to configuration files, log files, application binaries, and operating system components depending on the service account's effective permissions.
Root Cause
The root cause is external control of a file name or path [CWE-73]. The bac-scanresult handler accepts a path argument from the network-facing API and passes it to a filesystem delete operation without canonicalization, allowlisting, or restriction to an intended base directory. No additional authorization check verifies that the requesting user owns or has rights to the target file.
Attack Vector
The attack vector is network-based with low attack complexity. The attacker must possess valid low-privilege credentials but does not require user interaction. After authenticating, the attacker invokes the bac-scanresult method and substitutes a target path of their choosing. Successful invocation removes the specified file. Repeated requests can be chained to delete multiple files, destabilize the service, or remove forensic evidence such as security logs.
No verified proof-of-concept code is publicly available. See the CERT-VDE Security Advisory for vendor-supplied technical detail.
Detection Methods for CVE-2026-35076
Indicators of Compromise
- Unexpected invocations of the bac-scanresult method by accounts that do not normally use scan-result functionality
- File path parameters containing traversal sequences (../, ..\, encoded variants) or absolute paths pointing outside the application's working directory
- Missing log files, configuration files, or application artifacts following authenticated API activity
- Service restarts or errors traceable to deleted dependencies
Detection Strategies
- Enable verbose API request logging on the management interface and alert on bac-scanresult calls referencing paths outside expected directories
- Deploy filesystem integrity monitoring to flag deletions of critical files in real time
- Correlate authentication events with file deletion telemetry to identify low-privilege accounts triggering filesystem changes
Monitoring Recommendations
- Forward application and OS audit logs to a centralized analytics platform for retention and correlation
- Baseline normal bac-scanresult usage patterns and alert on deviations in volume or path arguments
- Monitor for failed login attempts followed by successful authentication, which may indicate credential compromise preceding exploitation
How to Mitigate CVE-2026-35076
Immediate Actions Required
- Apply the vendor patch referenced in CERT-VDE advisory VDE-2026-039 as soon as it is available for your deployment
- Restrict network access to the management interface to trusted administrative networks only
- Audit and rotate credentials for any low-privilege accounts that can reach the bac-scanresult endpoint
- Review filesystem integrity baselines to confirm no unauthorized deletions have occurred
Patch Information
Consult the CERT-VDE Security Advisory VDE-2026-039 for fixed version information and vendor remediation guidance. Apply updates in line with the vendor's deployment instructions and validate functionality in a staging environment before production rollout.
Workarounds
- Block network access to the affected management interface from untrusted segments using firewall or ACL rules until patching completes
- Enforce the principle of least privilege so service accounts running the affected method cannot delete critical OS or application files
- Disable user accounts that do not require access to the bac-scanresult functionality
- Enable backup and snapshot mechanisms to allow rapid restoration of deleted files
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
