Persistent Cross-Site Scripting Vulnerability in Advanced Guestbook by AMPPS
CVE-2021-47950

5.1MEDIUM

Key Information:

Vendor

Ampps

Status
Advanced Guestbook
Vendor
CVE Published:
10 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47950?

Advanced Guestbook version 2.4.4 contains a persistent cross-site scripting vulnerability that affects the smilies administration interface. Authenticated attackers can exploit this flaw by injecting malicious scripts through the s_emotion parameter. When administrators access the smilies tab, any JavaScript code submitted via POST requests to admin.php executes, potentially leading to compromised web security and user data exposure.

Affected Version(s)

Advanced Guestbook 2.4.4

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-47950 - Proof of Concept

References

https://www.exploit-db.com/exploits/49875
exploit
https://www.ampps.com/apps/guestbooks/Advanced_Guestbook
product
https://www.vulncheck.com/advisories/advanced-guestbook-p...
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Abdulkadir AYDOGAN
.