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OpenChoreo EUVDEUVD-2026-58543

| CVE-2026-73666 HIGH
Missing Authentication for Critical Function (CWE-306)
2026-08-13 security-advisories@github.com
8.2
CVSS 3.1 · Vendor: github
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Severity by source

Vendor (github) PRIMARY
8.2 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
vuln.today AI
8.2 HIGH

Network access with zero credentials required; high confidentiality from open catalog and log reads; low integrity from catalog location manipulation only; no availability impact.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (github).

CVSS VectorVendor: github

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

Lifecycle Timeline

4
Patch available
Aug 13, 2026 - 23:04 EUVD
Source Code Evidence Fetched
Aug 13, 2026 - 22:44 vuln.today
Analysis Generated
Aug 13, 2026 - 22:44 vuln.today
CVE Published
Aug 13, 2026 - 22:17 cve.org
HIGH 8.2

DescriptionCVE.org

OpenChoreo is a developer platform for Kubernetes. Prior to 1.0.4, 1.1.4, and 1.2.1, the OpenChoreo Backstage backend hardcoded backend.auth.dangerouslyDisableDefaultAuthPolicy and auth.providers.guest.dangerouslyAllowOutsideDevelopment to true, exposing /api/* without authentication and allowing unauthenticated catalog reads, scaffolder log reads, and catalog location creation or deletion. This issue is fixed in versions 1.0.4, 1.1.4, and 1.2.1.

AnalysisAI

Unauthenticated API access in OpenChoreo's Backstage backend exposes all /api/* routes to any network-reachable attacker, enabling catalog enumeration, scaffolder log reads, and catalog location creation or deletion without credentials. The root cause is two Backstage safety flags - dangerouslyDisableDefaultAuthPolicy and dangerouslyAllowOutsideDevelopment - hardcoded to true in both app-config.yaml and app-config.production.yaml, effectively disabling Backstage's authentication layer in all pre-fix deployments. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach Backstage backend HTTP port
Delivery
Send unauthenticated GET /api/catalog/entities
Exploit
Enumerate full software catalog
Execution
Read scaffolder task execution logs
Persist
POST malicious entry to /api/catalog/locations
Impact
Exfiltrate developer infrastructure metadata

Vulnerability AssessmentAI

Exploitation No special conditions are required - this is remote unauthenticated exploitation against the default shipped configuration of OpenChoreo Backstage plugins. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 score of 8.2 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N) accurately reflects the exposure: zero-complexity, zero-credential network exploitation granting high confidentiality impact and limited write capability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with network access to an OpenChoreo Backstage instance sends unauthenticated HTTP GET requests to `/api/catalog/entities` to enumerate the complete software catalog - including service names, ownership, and infrastructure metadata - then reads scaffolder template execution logs via `/api/scaffolder/v2/tasks/{id}/eventstream`, which may expose secrets or deployment parameters. The attacker subsequently issues POST requests to `/api/catalog/locations` to register attacker-controlled source URLs, potentially poisoning the catalog with malicious component definitions visible to all developers using the platform.
Remediation Upgrade to OpenChoreo Backstage plugins v1.0.4, v1.1.4, or v1.2.1 per your release branch, as confirmed by GitHub release tags and the vendor advisory at https://github.com/openchoreo/openchoreo/security/advisories/GHSA-v7qx-mqhq-grvh. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: inventory all OpenChoreo Backstage deployments and identify current versions; review API access logs for suspicious activity patterns and unauthorized queries. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-58543 vulnerability details – vuln.today

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