CVE-2025-53890

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.1%, top 37% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
63.3%
KEV
Not listed

Published

July 15, 2025

Last Modified

April 15, 2026

Advisory Details (3)

Auto-updated May 2, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Remote code execution through js2py onCaptchaResult · Advisory · pyload/pyload · GitHub

https://github.com/pyload/pyload/security/advisories/GHSA-8w3f-4r8f-pf53
generic

Fix Improper Neutralization of Input code injection interactive.user by odaysec · Pull Request #4586 · pyload/pyload · GitHub

https://github.com/pyload/pyload/pull/4586
generic

Fix Improper Neutralization of Input code injection interactive.user … · pyload/pyload@909e5c9 · GitHub

https://github.com/pyload/pyload/commit/909e5c97885237530d1264cfceb5555870eb9546

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
pyload-ng0.5.0a5.dev528 ... 0.5.0b3.dev89 (94 versions)0.20—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 42× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 117 total refreshes for this CVE.

  1. 2026-07-23 02:58 UTCEG score recompute
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Frequently asked(5)

What is CVE-2025-53890?
CVE-2025-53890 is a critical vulnerability published on July 15, 2025. 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…
When was CVE-2025-53890 disclosed?
CVE-2025-53890 was first published in the National Vulnerability Database on July 15, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-53890 actively exploited?
CVE-2025-53890 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 63.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-53890?
CVE-2025-53890 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2025-53890?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-53890, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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