Medium severity5.4NVD Advisory· Published Aug 13, 2026· Updated Aug 13, 2026
CVE-2026-67990
CVE-2026-67990
Description
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 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.
Affected products
2Patches
Vulnerability mechanics
References
3- gist.github.com/Zykis1024/cec690012eecac53f408e78d2b569f06nvd
- github.com/basecamp/upright/blob/efe4f2e5254ac6e57e45d2261804cca74dbbca3f/app/controllers/upright/alertmanager_proxy_controller.rbnvd
- github.com/basecamp/upright/blob/efe4f2e5254ac6e57e45d2261804cca74dbbca3f/app/controllers/upright/prometheus_proxy_controller.rbnvd
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