Medium severity4.8NVD Advisory· Published Jun 23, 2021· Updated Jun 17, 2026
CVE-2021-28977
CVE-2021-28977
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,
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- GetSimpleCMS/GetSimpleCMSdescription
- Range: =3.3.16
Patches
Vulnerability mechanics
References
1- github.com/GetSimpleCMS/GetSimpleCMS/issues/1336nvdThird Party Advisory
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