CVE-2026-34759Public exploitNetwork attack vector

Unauthenticated notification abuse via unprotected API routes

Published Apr 2, 2026 · Updated Apr 2, 2026

Missing authorization in OneUptime before 10.0.42 allows remote attackers to abuse notification services through exposed API routes. PhoneNumber, SMTPConfig, and WhatsApp handlers perform privileged operations without user-authentication middleware, and the proxy exposes them at /notification/. A public status page supplies the projectId needed for Twilio purchases and number deletion; SMTP credential reads instead require a guessed configuration UUID.

CVSS severity9.2
Critical
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Missing authorization in OneUptime before 10.0.42 allows remote attackers to abuse notification services through exposed API routes. PhoneNumber, SMTPConfig, and WhatsApp handlers perform privileged operations without user-authentication middleware, and the proxy exposes them at /notification/. A public status page supplies the projectId needed for Twilio purchases and number deletion; SMTP credential reads instead require a guessed configuration UUID.

The record

CVE
CVE-2026-34759
Published
Apr 2, 2026
Updated
Apr 2, 2026
Vendor
OneUptime
Product
OneUptime
Classifications
CWE-862, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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

9.2GitHubCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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 exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo