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MEDIUM severity

CVE-2024-39126

MEDIUM

CVE-2024-39126 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in roundup-tracker roundup. O3 Security detects and blocks CVE-2024-39126 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.

Roundup before 2.4.0 allows XSS via JavaScript in PDF, XML, and SVG documents.

Published
Jul 17, 2024
Updated
Jun 17, 2026
Affected
1 product
Patched
See advisory
Exploits
None indexed
Exploitation data as of Jun 17, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Description

Roundup before 2.4.0 allows XSS via JavaScript in PDF, XML, and SVG documents.

Affected Products

1 product · 1 configurations
Application
rounduproundup-tracker
< 2.4.0
range

Detection & mitigation playbook

Vendor / appliance
  1. Detect

    Inventory every roundup-tracker roundup 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 roundup-tracker roundup security patch or hotfix for CVE-2024-39126 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-2024-39126 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-2024-39126. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

Roundup before 2.4.0 allows XSS via JavaScript in PDF, XML, and SVG documents.
O3 Security · Runtime Protection

Is CVE-2024-39126 being exploited in your environment?

O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2024-39126 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.

CVE-2024-39126: Roundup Cross-site… | O3 Security