High severity · published Sep 29, 2026
CVE-2026-67993
basecamp/upright at commit efe4f2e5254ac6e57e45d2261804cca74dbbca3f contains a login cross-site request forgery issue in the static credentials callback
8.8
CVSS
0.1%
EPSS
No
On KEV
Description
basecamp/upright at commit efe4f2e5254ac6e57e45d2261804cca74dbbca3f contains a login cross-site request forgery issue in the static credentials callback.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-67993
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-67993
github.com
https://github.com/basecamp/upright
github.com
https://github.com/basecamp/upright/blob/efe4f2e5254ac6e57e45d2261804cca74dbbca3f/app/controllers/upright/sessions_controller.rb#L3