CVE-2026-29779: LYC8503 Uptimeflare

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

UptimeFlare is a serverless uptime monitoring & status page solution, powered by Cloudflare Workers. Prior to commit 377a596, configuration file uptime.config.ts exports both pageConfig (safe for client use) and workerConfig (server-only, contains sensitive data) from the same module. Due to pages/incidents.tsx importing and using workerConfig directly inside client-side component code, the entire workerConfig object was included in the client-side JavaScript bundle served to all visitors. This issue has been patched via commit 377a596.

Affected products

• LYC8503 Uptimeflare: before 2026-03-04 (fixed in 2026-03-04)

Published 2026-03-07. Last modified 2026-06-17.