Information disclosure in Lyc8503 Uptimeflare
CVE-2026-29779
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.
Vulnerability class: Information Disclosure
EPSS: 0.003 (20.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Lyc8503 Uptimeflare — versions < 377a5963c66ba9a798abebfe8d80378b053435e9
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-29779?
- CVE-2026-29779 is a high-severity vulnerability in Lyc8503 Uptimeflare, classified under Information Disclosure. CVSS score: 7.5/10. Published 2026-03-07.
- How severe is CVE-2026-29779?
- High severity. CVSS v3 base score is 7.5 out of 10.