CVE-2021-28931
HIGHCVSS 8.8/10EPSS 1.21%
Last modified
CVE-2021-28931 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Arbitrary file upload vulnerability in Fork CMS 5.9.2 allows attackers to create or replace arbitrary files in the /themes directory via a crafted zip file uploaded to the Themes panel.. EPSS estimates a 1.21% chance of exploitation in the next 30 days.
Description
Arbitrary file upload vulnerability in Fork CMS 5.9.2 allows attackers to create or replace arbitrary files in the /themes directory via a crafted zip file uploaded to the Themes panel.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Fork-Cms | Fork Cms | 5.9.2 |
References
- https://github.com/bousalman/ForkCMS-arbitrary-upload/blob/main/README.mdThird Party Advisory
- https://github.com/forkcms/forkcms/releases/tag/5.9.2Release Notes, Third Party Advisory
- https://github.com/bousalman/ForkCMS-arbitrary-upload/blob/main/README.mdThird Party Advisory
- https://github.com/forkcms/forkcms/releases/tag/5.9.2Release Notes, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-28931?
Arbitrary file upload vulnerability in Fork CMS 5.9.2 allows attackers to create or replace arbitrary files in the /themes directory via a crafted zip file uploaded to the Themes panel.
How severe is CVE-2021-28931?
CVE-2021-28931 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.21% probability of exploitation in the next 30 days.
How do I fix CVE-2021-28931?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-28931?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST