{"id":"CVE-2026-67990","title":"basecamp/upright at commit efe4f2e5254ac6e57e45d2261804cca74dbbca3f disables Rails CSRF protection for its Alertmanager and Prometheus proxy controllers","summary":"basecamp/upright at commit efe4f2e5254ac6e57e45d2261804cca74dbbca3f disables Rails CSRF protection for its Alertmanager and Prometheus proxy controllers. An unauthenticated attacker can induce a logged-in user's browser to submit request…","severity":"medium","cvss":5.4,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","cwe":["CWE-352"],"published":"2026-08-13","updated":"2026-09-08","sourceUpdated":"2026-09-08T19:42:20.313","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67990","references":[{"url":"https://gist.github.com/Zykis1024/cec690012eecac53f408e78d2b569f06","label":"cve@mitre.org"},{"url":"https://github.com/basecamp/upright","label":"cve@mitre.org"},{"url":"https://github.com/basecamp/upright/blob/efe4f2e5254ac6e57e45d2261804cca74dbbca3f/app/controllers/upright/alertmanager_proxy_controller.rb#L2","label":"cve@mitre.org"},{"url":"https://github.com/basecamp/upright/blob/efe4f2e5254ac6e57e45d2261804cca74dbbca3f/app/controllers/upright/prometheus_proxy_controller.rb#L2","label":"cve@mitre.org"}],"tags":["nvd"],"epss":0.00137,"epssPercentile":0.03475,"ingestedAt":"2026-09-08T20:10:03.157Z","slug":"CVE-2026-67990","body":"## Overview\n\nbasecamp/upright at commit efe4f2e5254ac6e57e45d2261804cca74dbbca3f disables Rails CSRF protection for its Alertmanager and Prometheus proxy controllers. An unauthenticated attacker can induce a logged-in user's browser to submit requests that are forwarded to enabled upstream write or management endpoints, such as creating an Alertmanager silence or requesting a Prometheus reload. The final impact depends on the APIs enabled by the upstream services.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":29.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}