CVE-2026-75517Public exploitNetwork attack vector

Cross-environment integration manipulation via unscoped lookups

Published Sep 22, 2026 · Updated Sep 22, 2026

Improper authorization in Novu before 3.18.0 allows remote authenticated users to alter integrations across sibling environments. Integration mutation use cases query by integration and organization identifiers without consistently constraining the environment identifier. An API key or dashboard session for one environment and a sibling integration identifier are required; dashboard-session exposure persists in 3.18.0.

CVSS severity6.5
Medium
EPSS probability0.70%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Novu before 3.18.0 allows remote authenticated users to alter integrations across sibling environments. Integration mutation use cases query by integration and organization identifiers without consistently constraining the environment identifier. An API key or dashboard session for one environment and a sibling integration identifier are required; dashboard-session exposure persists in 3.18.0.

The record

CVE
CVE-2026-75517
Published
Sep 22, 2026
Updated
Sep 22, 2026
Vendor
Novu
Product
Novu
Classifications
CWE-639, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 22, 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=< 3.18.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Novu · Novuversion=< 3.18.0

Published CVSS scores

6.5GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1565.001Stored Data Manipulation

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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