Vulnerability · Published Mar 7, 2026 · Assigned by GitHub_M

CVE-2026-29779UptimeFlare: Montior config / Credentials in `workerConfig` exposed in client-side JavaScript bundle

High 7.5

In plain English

A high-severity information exposure in UptimeFlare from lyc8503. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.3%top 73.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
lyc8503	UptimeFlare	< 377a5963c66ba9a798abebfe8d80378b053435e9

Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

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