AUGUST 4, 2026
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Case File

CVE-2021-28977

MEDIUM · CVSS 4.8 EPSS 0.51% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-06-23 · Last synced 2026-08-04

CyberRota Analysis

AI analysis pending.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2021-28977
Severity
MEDIUM
CVSS
4.8
EPSS
0.51%

Original NVD 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,