CVE-2021-28977
MEDIUMCVSS 4.8/10EPSS 0.51%
Last modified
CVE-2021-28977 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. Cross Site Scripting vulnerability in GetSimpleCMS 3.3.16 in admin/upload.php by adding comments or jpg and other file header information to the content of xla, pages, and gzip files,. EPSS estimates a 0.51% chance of exploitation in the next 30 days.
Description
Cross Site Scripting vulnerability in GetSimpleCMS 3.3.16 in admin/upload.php by adding comments or jpg and other file header information to the content of xla, pages, and gzip files,
Metrics
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Get-Simple | Getsimplecms | <= 3.3.15 |
References
- https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1336Third Party Advisory
- https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1336Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-28977?
Cross Site Scripting vulnerability in GetSimpleCMS 3.3.16 in admin/upload.php by adding comments or jpg and other file header information to the content of xla, pages, and gzip files,
How severe is CVE-2021-28977?
CVE-2021-28977 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.51% probability of exploitation in the next 30 days.
How do I fix CVE-2021-28977?
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-2021-28977?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST