PT-2026-39524 · Unknown · Advanced Guestbook

Abdulkadir Aydogan · Published 2026-05-10 · Updated 2026-05-10 · CVE-2021-47950

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Advanced Guestbook version 2.4.4

Description A persistent cross-site scripting issue exists in the smilies administration interface. Authenticated attackers can inject malicious scripts by sending POST requests to the 'admin.php' endpoint using the s emotion parameter. These scripts execute when administrators access the smilies tab.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability. As a temporary workaround, restrict access to the s emotion parameter within the 'admin.php' endpoint.

Exploit

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2021-47950

Affected Products

Advanced Guestbook

References · 5

• 🔥 https://exploit-db.com/exploits/49875 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-47950 · Security Note
• https://vulncheck.com/advisories/advanced-guestbook-persistent-xss-via-smilies · Note
• https://twitter.com/CVEnew/status/2053537415923740747 · Twitter Post
• https://ampps.com/apps/guestbooks/Advanced_Guestbook · Note