XSS in Ampps Advanced Guestbook
CVE-2021-47950
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (7.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Ampps Advanced Guestbook — versions 2.4.4
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/49875 (exploit)
- www.ampps.com/apps/guestbooks/Advanced_Guestbook (product)
- www.vulncheck.com/advisories/advanced-guestbook-persistent-xss-via-smilies (third-party-advisory)
Frequently asked questions
- What is CVE-2021-47950?
- CVE-2021-47950 is a medium-severity vulnerability in Ampps Advanced Guestbook, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-05-10.
- How severe is CVE-2021-47950?
- Medium severity. CVSS v3 base score is 6.4 out of 10.