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TI-2026-83016 Aliases CVE-2026-119552GHSA-hpf4-7mjx-jmh4

Race condition in Uptime Kuma lets attackers create extra admins

Priority LOW 28CWE-367Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Uptime Kuma through 2.5.8 contains a race condition in the Socket.IO first-run setup handler (CWE-367). An unauthenticated remote attacker can send concurrent setup requests during the bcrypt hashing window to bypass the empty user table check. This lets the attacker create an additional administrator account.

Written with Claude Haiku 5.5 from the sources below · 2026-10-30

Description from the CNA

Uptime Kuma through 2.5.8 contains a race condition in the Socket.IO first-run setup handler that allows unauthenticated attackers to create an additional administrator account. Attackers can send concurrent setup requests during the bcrypt hashing window to bypass the empty user table check, then modify monitors, API keys, and enable disableAuth.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00234 14th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
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
louislamuptime-kumaup to 2.5.8—No fix listedCNA
  • uptime-kuma Vendorlouislam Affected up to 2.5.8 Fixed in — No fix listed CNA

Remediation

No fixed version is listed for uptime-kuma.

Written with Claude Haiku 5.5 from the sources below · 2026-10-30

Timeline

  1. 2026-10-30 Threatist record created from CVE-2026-119552
  2. 2026-10-30 Alias added: GHSA-hpf4-7mjx-jmh4
  3. 2026-10-30 CISA SSVC decision points changed
  4. 2026-10-30 Priority changed: MEDIUM → LOW

References

Advisory 1

Other 2

  • TI-2026-51249 Path traversal in louislam dockge CVSS 4.0HIGH 8.7
  • TI-2024-37292 Local File Inclusion (LFI) via Improper URL Handling in uptime-kuma's `Real-Browser` monitor CVSS 3.1MEDIUM 6.8
  • TI-2026-49952 Uptime Kuma Stored XSS via Matomo Analytics Site ID on Public Status Pages CVSS 3.1HIGH 8.1

Sources

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