CVE-2026-44903 Prometheus: Stored XSS via crafted histogram bucket label values in the heatmap display of the old Prometheus web UI

Prometheus is an open-source monitoring system and time series database. From 2.49.0 to before 3.5.3 and 3.11.3, in the Prometheus server's legacy web UI enabled via the command-line flag --enable-feature=old-ui, the histogram heatmap chart view does not escape le label values when inserting them...