CVE-2026-29779 UptimeFlare: Montior config / Credentials in `workerConfig` exposed in client-side JavaScript bundle
Attackers can view sensitive server-side configuration and credentials by inspecting the client-side JavaScript bundle of the UptimeFlare status page.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-29779?
CVE-2026-29779 is a high-severity vulnerability in lyc8503 UptimeFlare, published on 7 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-200
Which versions are affected by CVE-2026-29779?
It affects 1 product.
Products include Lyc8503 Uptimeflare.
How do I fix CVE-2026-29779?
No fix has been published for CVE-2026-29779 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-29779 being exploited?
There is no known exploitation of CVE-2026-29779 in the wild and no public exploit code.
Sources
Also known as GHSA-36q9-v7p3-vj6v.