CVE-2026-1539

MEDIUM
MEDIUM Priority: 0.02 BB Relevance: 72/100
Published: 2026-01-28 Modified: 2026-11-05 First seen: 2026-11-05 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction Scope Change

CVSS Vector Breakdown

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

Description

A flaw was found in the libsoup HTTP library that can cause proxy authentication credentials to be sent to unintended destinations. When handling HTTP redirects, libsoup removes the Authorization header but does not remove the Proxy-Authorization header if the request is redirected to a different host. As a result, sensitive proxy credentials may be leaked to third-party servers. Applications using libsoup for HTTP communication may unintentionally expose proxy authentication data.

Bug Bounty Relevance

72 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

5.8 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

EPSS — Exploitation Probability

0.27%
Raw Score 0.002740
Percentile 20.0%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00274
2026-11-12
0.00274
2026-11-10
0.00274
2026-11-09
0.00274
2026-11-08
0.00274
2026-11-07
0.00274
2026-11-06
0.00274
2026-11-05
0.00274

Intelligence Sources

mitre ref →
nvd ref →