Dashboard / CVE-2026-40594

CVE-2026-40594

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 60/100
Published: 2026-04-21 Modified: 2026-11-11 First seen: 2026-11-11 Status: active

Attack Surface

Network No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: High
PR: None
UI: None
S: Unchanged
C: Low
I: None
A: Low

Description

pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev98, the set_session_cookie_secure before_request handler in src/pyload/webui/app/__init__.py reads the X-Forwarded-Proto header from any HTTP request without validating that the request originates from a trusted proxy, then mutates the global Flask configuration SESSION_COOKIE_SECURE on every request. Because pyLoad uses the multi-threaded Cheroot WSGI server (request_queue_size=512), this creates a race condition where an attacker's request can influence the Secure flag on other users' session cookies — either downgrading cookie security behind a TLS proxy or causing a session denial-of-service on plain HTTP deployments. This vulnerability is fixed in 0.5.0b3.dev98.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
pyload-ng_project pyload-ng < 0.5.0b3.dev69

References & Advisories (1)

Bug Bounty Relevance

60 / 100
✓ Network accessible
✓ No authentication
✓ No user interaction

CVSS Score

4.8 / 10.0 v3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

EPSS — Exploitation Probability

0.17%
Raw Score 0.001710
Percentile 6.5%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00171
2026-11-12
0.00171
2026-11-10
0.00171

Intelligence Sources

nvd ref →

External Links