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TI-2026-23365 Aliases CVE-2026-29779

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

Priority LOW 39CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-200.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00332 26th percentileScored 2026-11-07
Fix Fixed UptimeFlare (lyc8503): 377a596

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
lyc8503UptimeFlarebefore 377a596377a596Patch availableCNA
  • UptimeFlare Vendorlyc8503 Affected before 377a596 Fixed in 377a596 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:lyc8503:uptimeflare:*:*:*:*:*:*:*:*before 2026-03-04Vulnerablelyc8503
  • cpe:2.3:a:lyc8503:uptimeflare:*:*:*:*:*:*:*:* Versions before 2026-03-04 Vulnerable ·lyc8503

Remediation

  • Fix · CNA UptimeFlare (lyc8503) Fixed in 377a596

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-29779

References

Patch 1

Advisory 1

Other 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences