CVE-2026-34758Public exploitNetwork attack vector

Unauthenticated service abuse via unprotected notification routes

Published Apr 2, 2026 · Updated Apr 2, 2026

Missing authentication in OneUptime before 10.0.42 allows remote attackers to abuse notification services and manage phone numbers. Notification test and Phone Number API routes omit user-authentication middleware yet remain public through the /notification nginx route. No account or user interaction is required; configured Twilio, SMTP, and WhatsApp credentials can be used to send messages, place calls, purchase or release numbers, and expose stored service credentials.

CVSS severity9.1
Critical
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in OneUptime before 10.0.42 allows remote attackers to abuse notification services and manage phone numbers. Notification test and Phone Number API routes omit user-authentication middleware yet remain public through the /notification nginx route. No account or user interaction is required; configured Twilio, SMTP, and WhatsApp credentials can be used to send messages, place calls, purchase or release numbers, and expose stored service credentials.

The record

CVE
CVE-2026-34758
Published
Apr 2, 2026
Updated
Apr 2, 2026
Vendor
OneUptime
Product
OneUptime
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 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=< 10.0.42

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OneUptime · OneUptimeversion=< 10.0.42

Published CVSS scores

9.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

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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 exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

Public exploit references

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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