Pepr Overly Permissive RBAC ClusterRole in Admin Mode
Priority MEDIUM 53CWE-272Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.
Summary
Pepr is a type safe K8s middleware. Prior to 1.0.5 , Pepr defaults to a cluster-admin RBAC configuration and does not explicitly force or enforce least-privilege guidance for module authors. The default behavior exists to make the “getting started” experience smooth: new users can experiment with Pepr and create resources dynamically without needing to pre-configure RBAC. This vulnerability is fixed in 1.0.5.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00246 16th percentileScored 2026-11-07
Fix Fixed pepr (defenseunicorns): 1.0.5pepr (npm): 1.0.5
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| defenseunicorns | pepr | before 1.0.5 | 1.0.5 | Patch available | CNA |
| — | pepr (npm) | before 1.0.5 | 1.0.5 | Patch available | GHSA-w54x-r83c-x79q |
- pepr Vendordefenseunicorns Affected before 1.0.5 Fixed in 1.0.5 Patch available CNA
- pepr (npm) Vendor— Affected before 1.0.5 Fixed in 1.0.5 Patch available GHSA-w54x-r83c-x79q
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:defenseunicorns:pepr:*:*:*:*:*:*:*:* | before 1.0.5 | Vulnerable | defenseunicorns |
- cpe:2.3:a:defenseunicorns:pepr:*:*:*:*:*:*:*:* Versions before 1.0.5 Vulnerable ·defenseunicorns
Remediation
- Fix · CNA pepr (defenseunicorns) Fixed in 1.0.5
- Fix · GHSA-w54x-r83c-x79q pepr (npm) Fixed in 1.0.5 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-23634
- 2026-10-03 Alias added: GHSA-w54x-r83c-x79q
References
Advisory 2
Sources
- CVE-2026-23634 · CVE Program
- CVE-2026-23634 · NVD
- FIRST EPSS
- GHSA-w54x-r83c-x79q · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences