CVE-2026-107715CWE-200CWE-522information-disclosure

CVE-2026-107715

Medium · published October 9, 2026

CVSS v3.1
6.8
EPSS
0%
Percentile
32.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00395 · 32.5th percentile
Weaknesses
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor; CWE-522 · Insufficiently Protected Credentials
Published
2026-10-09T02:17Z
References (7)
https://github.com/sparklemotion/mechanize/commit/02a1235842d6eda8d4a5a3d8f13aba2cecf52e4f · [email protected]https://github.com/sparklemotion/mechanize/commit/94e0902867296be804f36eccbb47acf7d5018745 · [email protected]https://github.com/sparklemotion/mechanize/commit/ac49abf2869297d83c3b11bbfb8b18e63b588c95 · [email protected]https://github.com/sparklemotion/mechanize/pull/676 · [email protected]https://github.com/sparklemotion/mechanize/releases/tag/v2.14.1 · [email protected]https://github.com/sparklemotion/mechanize/security/advisories/GHSA-2mwr-xjcg-37j7 · [email protected]https://github.com/sparklemotion/mechanize/security/advisories/GHSA-2mwr-xjcg-37j7 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 10 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 08 OCT 21:27Z
    Mechanize sends credential headers to another host after an HTTP redirect
    cvelistv5
  • 08 OCT 21:27Z
    Mechanize sends credential headers to another host after an HTTP redirect
    cvelistv5