RCE in Pyload
CVE-2025-53890
pyload is an open-source Download Manager written in pure Python. An unsafe JavaScript evaluation vulnerability in pyLoad’s CAPTCHA processing code allows unauthenticated remote attackers to execute arbitrary code in the client browser and potentially the backend server. Exploitation requires no user interaction or authentication and can result in session hijacking, credential theft, and full system remote code execution. Commit 909e5c97885237530d1264cfceb5555870eb9546, the patch for the issue, is included in version 0.5.0b3.dev89.
Vulnerability class: RCE (Remote Code Execution)
EPSS: 0.011 (63.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Pyload — versions < 0.5.0b3.dev89
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-53890?
- CVE-2025-53890 is a critical-severity vulnerability in Pyload, classified under Code Injection. CVSS score: 9.8/10. Published 2025-07-15.
- How severe is CVE-2025-53890?
- Critical severity. CVSS v3 base score is 9.8 out of 10.