CVE-2026-29779Network attack vector

Credential disclosure via client-bundled worker configuration

Published Mar 7, 2026 · Updated Mar 7, 2026

Information disclosure in lyc8503 UptimeFlare before 377a596 allows remote attackers to read worker configuration from client bundles. The incidents page statically imports server-only workerConfig from uptime.config.ts, causing the build to serialize the entire object into visitor-accessible JavaScript. Exposure requires a deployment from the affected commit range and discloses configured monitor targets, authorization headers, API tokens, and notification webhooks without authentication.

CVSS severity7.5
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in lyc8503 UptimeFlare before 377a596 allows remote attackers to read worker configuration from client bundles. The incidents page statically imports server-only workerConfig from uptime.config.ts, causing the build to serialize the entire object into visitor-accessible JavaScript. Exposure requires a deployment from the affected commit range and discloses configured monitor targets, authorization headers, API tokens, and notification webhooks without authentication.

The record

CVE
CVE-2026-29779
Published
Mar 7, 2026
Updated
Mar 7, 2026
Vendor
lyc8503
Product
UptimeFlare
Classifications
CWE-200, T1552.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 377a5963c66ba9a798abebfe8d80378b053435e9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

lyc8503 · UptimeFlareversion=< 377a5963c66ba9a798abebfe8d80378b053435e9

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1552.001Unsecured Credentials: Credentials In Files

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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