EUVD-2026-58031
GHSA-q9r6-h8cx-q7qp
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Scope elevated to S:C because forged requests cross a trust boundary into separate upstream Alertmanager and Prometheus systems; all other metrics align directly with the CSRF pattern requiring no attacker privileges but active victim interaction.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Cross-site request forgery in basecamp/upright's Alertmanager and Prometheus proxy controllers allows unauthenticated attackers to exploit authenticated user sessions by inducing browser-submitted requests that bypass Rails CSRF protection entirely. At the specific commit efe4f2e5254ac6e57e45d2261804cca74dbbca3f, both proxy controllers skip the Rails authenticity token check, exposing upstream monitoring write and management APIs - including Alertmanager silence creation and Prometheus configuration reload - to attacker-controlled actions without the victim's awareness. A public proof-of-concept gist has been published by the reporting researcher, and no patched release has been confirmed at time of analysis.
Technical ContextAI
Upright is a Ruby on Rails engine authored by Basecamp that acts as an authenticated reverse proxy for Alertmanager and Prometheus monitoring services. Rails implements CSRF protection through the protect_from_forgery mechanism, which validates a per-session authenticity token on all state-changing requests. The vulnerable code, directly observable in the referenced source files at commit efe4f2e5254ac6e57e45d2261804cca74dbbca3f, skips this protection in Upright::AlertmanagerProxyController and Upright::PrometheusProxyController, meaning any cross-origin POST or management request forwarded through these controllers lacks origin validation. CWE-352 (Cross-Site Request Forgery) describes this root-cause class precisely: the server trusts browser-originated requests without verifying they were intentionally initiated by the authenticated user. The CPE is listed as cpe:2.3:a:n/a:n/a:*:*:*:*:*:*:*:*, indicating the package is not formally catalogued in NVD's product dictionary, consistent with its distribution as a niche Rails engine via GitHub rather than a published gem with versioned releases.
RemediationAI
No vendor-released patch or fixed version has been confirmed at time of analysis; affected versions should be assessed against the upstream repository at https://github.com/basecamp/upright for any remediation commits following the disclosure. The primary code-level fix is to re-enable Rails CSRF protection in both Upright::AlertmanagerProxyController and Upright::PrometheusProxyController by removing any skip_before_action :verify_authenticity_token or equivalent directive from those controllers. As an immediate compensating control, restrict the Upright proxy's routing to expose only read-only Alertmanager and Prometheus endpoints at the application or network layer - blocking POST and management-path requests prevents the meaningful impact even while the CSRF flaw persists, though this may reduce operator usability for silence management workflows. A secondary hardening measure is to independently bind upstream Alertmanager and Prometheus management APIs to loopback or internal-only interfaces so that forged requests cannot reach sensitive management endpoints via any path, not solely through the proxy.
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Same weakness CWE-352 – Cross-Site Request Forgery (CSRF)
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External POC / Exploit Code
Leaving vuln.today