Vulnerability details

CVE-2026-29779

lyc8503 UptimeFlare

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

CVSS 3.1

7.5High

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.

CVSS scores

Score	Version	Source	Vector
7.5High	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`

Affected products

Vendor	Product	Versions	Source
lyc8503	UptimeFlare	< 377a5963c66ba9a798abebfe8d80378b053435e9	CVEProject cvelistV5 (CNA)

References and advisories

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

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Details

Published: 2026-03-07
Last updated: 2026-03-09
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.33%

Probability of exploitation in 30 days

26.5%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-200
Exposure of Sensitive Information to an Unauthorized Actor