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CVE-2026-119552medium6.3

Uptime Kuma through 2.5.8 Race Condition Admin Creation via Setup Handler

Impact

Uptime Kuma through version 2.5.8 has a race condition vulnerability that allows unauthenticated attackers to create an administrator account by sending concurrent setup requests. This weakness can be used to modify monitors, API keys, and disable authentication.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

louislam · VulnCheck

uptime-kuma

1 range
VulnCheck version evidence

Package identity

pkg:github/louislam/uptime-kuma

Identity supplied by VulnCheck. Version matching requires compatible range evidence.

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → through 2.5.8

semver versions

unaffected

unknown

Other versions: unaffected

Original source description

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.

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-119552

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-367 ↗

Time-of-check Time-of-use (TOCTOU) Race Condition

VulnCheck

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

VulnCheck · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:a:uptime-kuma_project:uptime-kuma:*:*:*:*:*:*:*:*

Through (inclusive): 2.5.8

Original applicability statements
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:uptime-kuma_project:uptime-kuma:*:*:*:*:*:*:*:*",
            "versionEndIncluding": "2.5.8"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 2
VulnCheck

Assigning organization

2026-10-30
CISA-ADP

Additional data publisher

2026-10-30

What changed

Follow changes
  1. CVE · CVE-2026-119552

    Observed 2026-10-30T17:20:18.114Z · upstream updated 2026-10-30T15:54:36.118Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-10-30T15:21:04.753408Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "partial"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

References

4 sources
github.com/louislam/uptime-kuma/blob/2.5.8/server/server.js
technical-descriptionVulnCheck
abraxaslabs.tech/research/uptime-kuma-setup-toctou
third-party-advisoryVulnCheck
github.com/louislam/uptime-kuma
productVulnCheck
www.vulncheck.com/advisories/uptime-kuma-through-2.5.8-race-condition-admin-creation-via-setup-handler
third-party-advisoryVulnCheck