Spectra Legacy
Monthly
CSS injection in the Spectra Legacy WordPress plugin before version 2.20.0 allows authenticated Contributors to embed arbitrary CSS via unvalidated block style attributes that are output verbatim to page front-ends. Anonymous visitors loading affected pages are exposed to attacker-controlled styles enabling page defacement, UI redressing, external resource loading, and side-channel data exfiltration through CSS attribute selectors. JavaScript execution is explicitly blocked by WordPress KSES filtering, constraining the worst-case impact; a publicly available proof-of-concept exists per WPScan, though EPSS sits at 0.12% (2nd percentile), indicating low observed exploitation probability and no CISA KEV listing.
CSS injection in the Spectra Legacy WordPress plugin before version 2.20.0 allows authenticated Contributors to embed arbitrary CSS via unvalidated block style attributes that are output verbatim to page front-ends. Anonymous visitors loading affected pages are exposed to attacker-controlled styles enabling page defacement, UI redressing, external resource loading, and side-channel data exfiltration through CSS attribute selectors. JavaScript execution is explicitly blocked by WordPress KSES filtering, constraining the worst-case impact; a publicly available proof-of-concept exists per WPScan, though EPSS sits at 0.12% (2nd percentile), indicating low observed exploitation probability and no CISA KEV listing.