The Mechanize library is used for automating interaction with websites. Prior to 2.14.1, Mechanize sends caller-supplied credential headers to a different host after an HTTP redirect. Mechanize#request_headers= is reapplied by Mechanize::HTTP::Agent#request_add_headers even after Mechanize::HTTP::Agent#response_redirect strips per-request headers, and the protected header lists omit Proxy-Authorization and Cookie2. An attacker who controls a redirect target can capture bearer tokens or session cookies supplied through request_headers= or the per-request headers argument, while Mechanize#cookie_jar and Mechanize::HTTP::AuthStore are not affected. This issue is fixed in version 2.14.1.
History

Fri, 09 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 09 Oct 2026 09:15:00 +0000

Type Values Removed Values Added
First Time appeared Sparklemotion
Sparklemotion mechanize
Vendors & Products Sparklemotion
Sparklemotion mechanize

Fri, 09 Oct 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-212
References
Metrics threat_severity

None

threat_severity

Moderate


Thu, 08 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
Description The Mechanize library is used for automating interaction with websites. Prior to 2.14.1, Mechanize sends caller-supplied credential headers to a different host after an HTTP redirect. Mechanize#request_headers= is reapplied by Mechanize::HTTP::Agent#request_add_headers even after Mechanize::HTTP::Agent#response_redirect strips per-request headers, and the protected header lists omit Proxy-Authorization and Cookie2. An attacker who controls a redirect target can capture bearer tokens or session cookies supplied through request_headers= or the per-request headers argument, while Mechanize#cookie_jar and Mechanize::HTTP::AuthStore are not affected. This issue is fixed in version 2.14.1.
Title Mechanize sends credential headers to another host after an HTTP redirect
Weaknesses CWE-200
CWE-522
References
Metrics cvssV3_1

{'score': 6.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-08T21:27:24.651Z

Updated: 2026-10-09T13:22:27.174Z

Reserved: 2026-10-08T17:21:52.975Z

Link: CVE-2026-107715

cve-icon Vulnrichment

Updated: 2026-10-09T13:22:09.693Z

cve-icon NVD

Status : Deferred

Published: 2026-10-08T22:17:27.163

Modified: 2026-10-09T16:40:29.800

Link: CVE-2026-107715

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-08T21:27:24Z

Links: CVE-2026-107715 - Bugzilla