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CVE-2021-37504

MEDIUM

A cross-site scripting (XSS) vulnerability in the fileNameStr parameter of jQuery-Upload-File v4.0.11 allows attackers to execute arbitrary web scripts or HTML via a crafted file with…

Published
Feb 25, 2022
Updated
Jun 17, 2026
Affected
0 pkgs
Patched
None yet
Exploits
None indexed

EPSS Exploitation Probability

via FIRST.org ↗
0.9%probability of exploitation in next 30 days
Lower Risk54th percentile+0.16%
0.22%0.60%0.99%1.37%0.7%0.9%Dec 25Apr 26Jun 26

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

A cross-site scripting (XSS) vulnerability in the fileNameStr parameter of jQuery-Upload-File v4.0.11 allows attackers to execute arbitrary web scripts or HTML via a crafted file with a Javascript payload in the file name.

Affected Products

1 product · 1 configurations
Application
jquery upload filehayageek
1 version
4.0.11

Detection & mitigation playbook

Vendor / appliance
  1. Detect

    Inventory every hayageek jquery upload file 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. Remediation status

    No patch has shipped for CVE-2021-37504 yet — track the hayageek jquery upload file advisory for a fixed release and apply the workarounds below in the meantime.

  3. Mitigate without a patch

    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-2021-37504 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-2021-37504. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

A cross-site scripting (XSS) vulnerability in the fileNameStr parameter of jQuery-Upload-File v4.0.11 allows attackers to execute arbitrary web scripts or HTML via a crafted file with a Javascript payload in the file name.
O3 Security · Runtime Protection

Is CVE-2021-37504 being exploited in your environment?

O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2021-37504 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.