CVE-2026-107399
Mechanize sends credential headers to another origin after a meta refresh
- State
- Published
- Severity
- 6.8 Medium
- Published
- Oct 8, 2026
- Updated
- Oct 14, 2026
- Reserved
- Oct 7, 2026
Description
The Mechanize library is used for automating interaction with websites. Prior to 2.14.1, Mechanize applies no origin trust boundary in Mechanize::HTTP::Agent#response_follow_meta_refresh when Mechanize#follow_meta_refresh is enabled. A page containing a meta refresh to another origin causes headers configured through Mechanize#request_headers= to be reapplied to the refresh request, allowing an attacker who controls content in the crawl to capture bearer tokens or session cookies. The default configuration is not affected because follow_meta_refresh is false, and the exposure is limited to caller-supplied default headers. This issue is fixed in version 2.14.1.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.8 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N | GitHub_M |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
mechanizesparklemotion |
|
References
- https://github.com/sparklemotion/mechanize/security/advisories/GHSA-c6rp-p8xm-4q9f
- https://github.com/sparklemotion/mechanize/pull/676
- https://github.com/sparklemotion/mechanize/commit/02a1235842d6eda8d4a5a3d8f13aba2cecf52e4f
- https://github.com/sparklemotion/mechanize/commit/84c74df87d15f5d119df268ba6aa79bc1e16a2c3
- https://github.com/sparklemotion/mechanize/releases/tag/v2.14.1
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