Medium 6.8Published Oct 8, 2026

CVE-2026-107399Mechanize sends credential headers to another origin after a meta refresh

Updated under an hour ago (2026-10-19 07:23 UTC)

Does this affect you?

It affects sparklemotion mechanize. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for sparklemotion mechanize

Exploited in the last 30 days

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.

CVSS: 6.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Weakness (CWE): CWE-200, CWE-522
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

sparklemotion mechanize sparklemotion:mechanize (from the name)	before 2.15.0	CNA record

References

https://github.com/sparklemotion/mechanize/security/advisories/GHSA-c6rp-p8xm-4q9fx-refsource-confirm
https://github.com/sparklemotion/mechanize/pull/676x-refsource-misc
https://github.com/sparklemotion/mechanize/commit/02a1235842d6eda8d4a5a3d8f13aba2cecf52e4fx-refsource-misc
https://github.com/sparklemotion/mechanize/commit/84c74df87d15f5d119df268ba6aa79bc1e16a2c3x-refsource-misc
https://github.com/sparklemotion/mechanize/releases/tag/v2.14.1x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.