by Kastro
Paper/Archive/CVE-2025-53890

CVE-2025-53890

pyload pyload — pyLoad vulnerable to remote code execution through js2py onCaptchaResult

EPSS 1%public exploitCVSS 9.8
critical.is priorityof 100
54
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 70.4.704 × 2014.1Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
pyload< 0.5.0b3.dev89–CNA

Scores by source

GitHub_M (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitgithub.com/pyload/pyload/security/advisories/GHSA-8w3f-4r8f-pf53refgithub.com/pyload/pyload/pull/4586refgithub.com/pyload/pyload/commit/909e5c97885237530d1264cfceb5555870eb9546