FastCMS JWT hard-coded key
Priority MEDIUM 45CWE-320Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-321.
Summary
A vulnerability was found in FastCMS 0.1.5. It has been declared as critical. This vulnerability affects unknown code of the component JWT Handler. The manipulation leads to use of hard-coded cryptographic key . The attack can be initiated remotely. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00486 42nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix No fix listed No fixed version in the sources yet
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 |
|---|---|---|---|---|---|
| — | FastCMS | 0.1.5 | — | No fix listed | CNA |
- FastCMS Vendor— Affected 0.1.5 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:fastcms_project:fastcms:0.1.5:*:*:*:*:*:*:* | 0.1.5 | Vulnerable | Fastcms Project |
- cpe:2.3:a:fastcms_project:fastcms:0.1.5:*:*:*:*:*:*:* Versions 0.1.5 Vulnerable ·Fastcms Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-3177
- 2026-10-03 Alias added: GHSA-4hmf-3gjv-f764
References
More Fastcms Project Fastcms vulnerabilities
- TI-2023-00617 FastCMS Template Management unrestricted upload CVSS 4.0MEDIUM 5.3
Sources
- CVE-2025-3177 · CVE Program
- CVE-2025-3177 · NVD
- FIRST EPSS
- GHSA-4hmf-3gjv-f764 · 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