TI-2026-33142 Aliases CVE-2026-45348 GHSA-fcjq-435v-jx94

pyLoad: Stored XSS in Downloads view via unsanitized link URL in packages.js template literal

LOW 39CWE-79Published 2026-05-28 · Updated 2026-05-28

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev100, the packages.js template at src/pyload/webui/app/themes/modern/templates/js/packages.js:172 interpolates a stored link URL into a template literal inside single-quoted HTML and then writes the result to the DOM via $(div).html(html). No escaping runs between the API value and innerHTML. An attacker (Alice) who can submit a package link puts a single quote plus event handler into the URL, breaks out of the attribute, and executes JavaScript in every operator's browser that opens the downloads view. The theme does not set a Content Security Policy that restricts inline script or event handlers. This vulnerability is fixed in 0.5.0b3.dev100.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00199 9th percentileScored 2026-11-07

Fix Fixed pyload (pyload): 0.5.0b3.dev100

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
pyload	pyload	before 0.5.0b3.dev100	0.5.0b3.dev100	Patch available	CNA
—	pyload-ng (PyPI)	up to 0.5.0b3.dev99	—	No fix listed	GHSA-fcjq-435v-jx94

pyload Vendorpyload Affected before 0.5.0b3.dev100 Fixed in 0.5.0b3.dev100 Patch available CNA
pyload-ng (PyPI) Vendor— Affected up to 0.5.0b3.dev99 Fixed in — No fix listed GHSA-fcjq-435v-jx94

Remediation

Fix · CNA pyload (pyload) Fixed in 0.5.0b3.dev100

Timeline

2026-10-02 Threatist record created from CVE-2026-45348
2026-10-03 Alias added: GHSA-fcjq-435v-jx94
2026-10-25 Priority changed: MEDIUM → LOW

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-45348

Other 2

TI-2023-00282 Code Injection in pyload/pyload CVSS 3.1CRITICAL 9.8
TI-2025-34556 pyLoad CNL Blueprint is vulnerable to Path Traversal through `dlc_path` leading to Remote Code Execution (RCE) CVSS 3.1CRITICAL 9.8
TI-2025-33765 pyLoad vulnerable to remote code execution through js2py onCaptchaResult CVSS 3.1CRITICAL 9.8
TI-2023-00412 Excessive Attack Surface in pyload/pyload CVSS 3.1CRITICAL 9.8
TI-2026-27589 pyLoad has SSRF fix bypass via HTTP redirect CVSS 4.0CRITICAL 9.3
TI-2026-26332 pyLoad: Server-Side Request Forgery via Download Link Submission Enables Cloud Metadata Exfiltration CVSS 4.0CRITICAL 9.3

See all 49 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences