Only self-managed Grafana instances with Auth Proxy authentication and identity caching enabled (sync_ttl greater than zero) are affected. The Auth Proxy cache key concatenated the username and forwarded identity attributes without a delimiter, so distinct identities could collide on one key. An authenticated user who shapes their own attributes to collide with a higher-privileged user's, while that user's cache entry is live, is authenticated as that user, up to Administrator (authentication bypass by spoofing).
{
"cpes": [
"cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:*",
"cpe:2.3:a:grafana:grafana:*:*:*:*:enterprise:*:*:*",
"cpe:2.3:a:grafana:grafana:*:*:*:*:-:*:*:*",
"cpe:2.3:a:grafana:grafana:*:*:*:*:*:go:*:*"
],
"severity": "High"
}