CVE-2021-47950
Advanced Guestbook 2.4.4 Persistent XSS via Smilies
Description
Advanced Guestbook 2.4.4 contains a persistent cross-site scripting vulnerability in the smilies administration interface that allows authenticated attackers to inject malicious scripts by manipulating the s_emotion parameter. Attackers can submit POST requests to admin.php with JavaScript code in the s_emotion field, which executes when administrators view the smilies tab.
INFO
Published Date :
May 10, 2026, 1:16 p.m.
Last Modified :
July 20, 2026, 8:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update Advanced Guestbook to a patched version.
- Sanitize the s_emotion parameter input.
- Validate administrator access to smilies.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47950.
| URL | Resource |
|---|---|
| https://www.ampps.com/apps/guestbooks/Advanced_Guestbook | |
| https://www.exploit-db.com/exploits/49875 | |
| https://www.vulncheck.com/advisories/advanced-guestbook-persistent-xss-via-smilies |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47950 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47950
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47950 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47950 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 20, 2026
Action Type Old Value New Value Added Translation Title: Advanced Guestbook de Ampps, Description: Advanced Guestbook 2.4.4 contiene una persistente cross-site scripting vulnerabilidad en la interfaz de administración de emoticonos que permite a atacantes autenticados inyectar scripts maliciosos manipulando el parámetro s_emotion. Los atacantes pueden enviar solicitudes POST a admin.PHP con código JavaScript en el campo s_emotion, que se ejecuta cuando los administradores ven la pestaña de emoticonos. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Ampps', 'product': 'Advanced Guestbook', 'versions': [{'status': 'affected', 'version': '2.4.4'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2021-47950', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-05-12T02:40:12.501481Z'} -
New CVE Received by [email protected]
May. 10, 2026
Action Type Old Value New Value Added Description Advanced Guestbook 2.4.4 contains a persistent cross-site scripting vulnerability in the smilies administration interface that allows authenticated attackers to inject malicious scripts by manipulating the s_emotion parameter. Attackers can submit POST requests to admin.php with JavaScript code in the s_emotion field, which executes when administrators view the smilies tab. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N Added CWE CWE-79 Added Reference https://www.ampps.com/apps/guestbooks/Advanced_Guestbook Added Reference https://www.exploit-db.com/exploits/49875 Added Reference https://www.vulncheck.com/advisories/advanced-guestbook-persistent-xss-via-smilies