Novu: Cross-Environment Integration Manipulation (IDOR) (CVE-2026-75517) | HOL Guard CVE

Medium · CVSS 6.5CVE-2026-75517

Novu: Cross-Environment Integration Manipulation (IDOR)

Answer in brief

CVE-2026-75517 records a Medium severity (CVSS 6.5) vulnerability in Novu: Cross-Environment Integration Manipulation (IDOR). The current sources do not mark it as known exploited. The current feed maps @novu/api-service (generic), novuhq/novu (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 22, 2026Updated Sep 22, 2026Source checked Sep 22, 2026First seen by HOL Sep 22, 2026Material review Sep 22, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.5
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps @novu/api-service (generic), novuhq/novu (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
@novu/api-servicegeneric	<3.18.0	3.18.0
novuhq/novugeneric	<3.18.0	3.18.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for @novu/api-service, novuhq/novu.
Review the reported fix. Update @novu/api-service to 3.18.0; novuhq/novu to 3.18.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 22, 2026

Sources and claim methodology

Upstream source description

Novu provides an API for sending notifications through multiple channels. Prior to 3.18.0, Novu integration mutation use cases including remove-integration, update-integration, auto-configure-integration, and set-integration-as-primary look up an integration by integrationId and organizationId without consistently enforcing environmentId. A caller with access to one environment in an organization can target an integration identifier from another environment and delete the integration, modify its credentials, change the primary provider, or trigger auto-configuration. The repository advisory defines both environment API keys and dashboard sessions as affected. The 3.18.0 change enforces the environment boundary only for environment-scoped API-key authentication, while its tests intentionally retain cross-environment dashboard-session behavior, so it does not completely remediate the advisory-defined scope. Version 3.18.0 is a partial fix attempt, and the dashboard-session behavior requires curator resolution.

Quoted source text, attributed separately from HOL analysis.