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CVE-2023-49656

CRITICAL

CVE-2023-49656 is a critical-severity (CVSS 9.8) XML External Entity (XXE) vulnerability in jenkins matlab. O3 Security detects and blocks CVE-2023-49656 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.

Jenkins MATLAB Plugin 2.11.0 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.

Published
Nov 29, 2023
Updated
Jun 17, 2026
Affected
1 product
Patched
See advisory
Exploits
None indexed

Description

Jenkins MATLAB Plugin 2.11.0 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.

Affected Products

1 product · 1 configurations
Application
matlabjenkins
< 2.11.1
range

Detection & mitigation playbook

Vendor / appliance
  1. Detect

    Inventory every jenkins matlab deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for exploitation at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.

  2. Fix

    Apply the jenkins matlab security patch or hotfix for CVE-2023-49656 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.

  4. How O3 protects you

    O3 detects and blocks CVE-2023-49656 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.

Tailored to CVE-2023-49656. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

Jenkins MATLAB Plugin 2.11.0 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.
O3 Security · Runtime Protection

Is CVE-2023-49656 being exploited in your environment?

O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2023-49656 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.