CVE-2025-53890CWE-94

pyLoad vulnerable to remote code execution through js2py onCaptchaResult

Critical · published July 14, 2025

CVSS v3.1
9.8
EPSS
1%
Percentile
70.2
In the wild
Unconfirmed
What it is

🚨 An unsafe JavaScript evaluation in pyLoad’s CAPTCHA code is your ticket to chaos! Unauthenticated attackers can execute arbitrary code without breaking a sweat! 🔥 Think of it like a fast-food drive-thru where anyone can place an order without ever being screened — if they know the right tricks, they could ask for anything on the menu, including stealing your secret sauce! 🍔 This vulnerability is absolutely devastating! An attacker could hijack your session, steal sensitive credentials, and potentially gain full control over your backend system. The stakes are high, and without action, your entire setup could be compromised!

Put simply

Think of it like a fast-food drive-thru where anyone can place an order without ever being screened — if they know the right tricks, they could ask for anything on the menu, including stealing your secret sauce! 🍔 This vulnerability in pyLoad allows remote attackers to exploit unsafe JavaScript evaluation during CAPTCHA processing, granting them the ability to run arbitrary code. The flaw stems from a lack of security checks in the code, allowing unauthenticated access to sensitive operations.

What to do

This vulnerability is absolutely devastating! An attacker could hijack your session, steal sensitive credentials, and potentially gain full control over your backend system. The stakes are high, and without action, your entire setup could be compromised! To protect yourself, upgrade to version 0.5.0b3.dev89, where the patch for this vulnerability is included. Additionally, review your JavaScript handling practices and consider implementing stricter input validation to mitigate similar risks in the future. You've got this! Take these steps, and you’ll reinforce your defenses like a security pro! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.01298 · 70.2th percentile
Weakness
CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2025-07-14T23:57Z
EPSS history
Timeline
  • 14 JUL 23:57Z
    pyLoad vulnerable to remote code execution through js2py onCaptchaResult
    cvelistv5