CVE-2026-29779

UptimeFlare: Montior config / Credentials in `workerConfig` exposed in client-side JavaScript bundle

CVSS 7.5 HIGHEPSS 0.3%CWE-200

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.5EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

07 Mar 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

lyc8503 · UptimeFlare

References

https://github.com/lyc8503/UptimeFlare/commit/377a5963c66ba9a798abebfe8d80378b053435e9 https://github.com/lyc8503/UptimeFlare/issues/198 https://github.com/lyc8503/UptimeFlare/security/advisories/GHSA-36q9-v7p3-vj6v