CVE-2021-47950
📛 CVE Title
(no title)
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.
Overview
- State
- —
- Assigner (CNA)
- —
- CVSS severity
- medium
- CVSS score
- 6.4 / 10
- CVSS vector
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N- Effective score
- 6.4 / 10 MEDIUM source: CNA overview
- CWE(s)
- —
- Reserved
- —
- Published
- —
- Last updated
- —
- Source
- https://www.tenable.com/cve/CVE-2021-47950
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-05-10 13:16:31 UTC
- NVD last modified
- 2026-05-12 14:24:15 UTC
- NVD CVSS v3.1
- 6.4 / 10 MEDIUM source: disclosure@vulncheck.com
- NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N- Exploitability subscore
- 3.1 / 10
- Impact subscore
- 2.7 / 10
- EPSS score
- 0.0003 (probability of exploitation in next 30 days)
- EPSS percentile
- 9.57% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24
NVD-assigned CWE(s):
CWE-79
(differs from the CNA list above)
NVD / KEV / EPSS data refreshed 2026-05-24 23:59 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2021-34810 - Assigner
- VulnCheck
- Published
- May 10, 2026, 12:52:11 PM
- Updated
- May 24, 2026, 1:37:12 AM
- EUVD base score (CVSS 4.0)
-
5.1 / 10
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N - EUVD-reported EPSS
- 0.0300
- Vendors
- Ampps
- Products
-
Advanced Guestbook (2.4.4)
ENISA 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.
Vendor references (0)
References embedded in the original CVE record by the assigning CNA.
None in the CVE record.
Web references (6)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- https://nvd.nist.gov/vuln/detail/CVE-2021-47950 tenable:nvd.nist.gov
- https://www.ampps.com/apps/guestbooks/Advanced_Guestbook tenable:www.ampps.com
- https://www.cve.org/CVERecord?id=CVE-2021-47950 tenable:www.cve.org
- https://www.exploit-db.com/exploits/49875 tenable:www.exploit-db.com
- https://www.first.org/epss/ tenable:www.first.org
- https://www.vulncheck.com/advisories/advanced-guestbook-persistent-xss-via-smilies tenable:www.vulncheck.com
NVD-tagged references (3)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://www.ampps.com/apps/guestbooks/Advanced_Guestbook disclosure@vulncheck.com
- https://www.exploit-db.com/exploits/49875 disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/advanced-guestbook-persistent-xss-via-smilies disclosure@vulncheck.com
Remediations (10)
-
web:attack.mitre.org
This mitigation can be implemented through the following measures: Regular Operating System Updates Implementation: Apply the latest Windows security updates monthly using WSUS (Windows Server Update Services) or a similar patch management solution. Configure systems to check for updates automatically and schedule reboots during maintenance ...
2026-05-26 03:07 UTC -
web:blog.qualys.com
Oracle released its third quarterly edition of this year's Critical Patch Update. The update received patches for 374 security vulnerabilities.
2026-05-26 03:07 UTC -
web:dbsguru.com
Oracle Critical Database Patch ID for July 2025 along with enabled Download Link An Essential/Critical Patch Update could be a collection of patches for multiple security vulnerabilities. These patches address vulnerabilities in Oracle code and third-party elements enclosed in Oracle merchandise. These patches are sometimes additive, however, every informative describes only the protection ...
2026-05-26 03:07 UTC -
web:portal.msrc.microsoft.com
The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.
2026-05-26 03:07 UTC -
web:www.computerworld.com
Microsoft says it is considering a patch for a zero-day vulnerability, dubbed YellowKey, that allows attackers with access to a Windows device to bypass Bitlocker encryption protection and read ...
2026-05-26 03:07 UTC -
web:www.howtogeek.com
In this case, use your PC's built-in Windows Update troubleshooter to automatically find and fix issues with your updates. Only a little interaction is required from your end. To run that tool, go to Settings > Update & Security > Troubleshoot > Additional Troubleshooters > Windows Update and click "Run the Troubleshooter".
2026-05-26 03:07 UTC -
web:www.oracle.com
This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.
2026-05-26 03:07 UTC -
web:www.pcworld.com
Windows 11's Secure Boot fix update finally rolls out to more PCs Important security certificates for Windows 11 will soon expire for many users.
2026-05-26 03:07 UTC -
web:www.securityweek.com
Oracle on Tuesday announced the release of 481 new security patches as part of its April 2026 Critical Patch Update (CPU). Across the 28 product families that received security updates, more than 300 patches address vulnerabilities that are remotely exploitable without authentication.
2026-05-26 03:07 UTC -
web:www.windowscentral.com
A faulty BitLocker configuration is forcing some PCs into BitLocker recovery mode after the April 2026 update, but there's a workaround to resolve this issue.
2026-05-26 03:07 UTC
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