CVE-2021-24275

MEDIUM NUCLEI

Popup by Supsystic < 1.10.5 - Reflected Cross-Site Scripting via Tab Parameter

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-24275. PoCs published by 0xB9. A Nuclei detection template is also available.

AI-analyzed exploit summary This exploit demonstrates a reflected XSS vulnerability in the WordPress Plugin Popup 1.10.4 by injecting malicious JavaScript via the unsanitized 'tab' parameter in the admin page URL. The PoC triggers an alert dialog as proof of concept.

Description

The Popup by Supsystic WordPress plugin before 1.10.5 did not sanitise the tab parameter of its options page before outputting it in an attribute, leading to a reflected Cross-Site Scripting issue

Exploits (1)

exploitdb WORKING POC
by 0xB9 · textwebappsphp
https://www.exploit-db.com/exploits/50346

This exploit demonstrates a reflected XSS vulnerability in the WordPress Plugin Popup 1.10.4 by injecting malicious JavaScript via the unsanitized 'tab' parameter in the admin page URL. The PoC triggers an alert dialog as proof of concept.

Classification
Working Poc 100%
Attack Type
Xss
Complexity
Trivial
Reliability
Reliable
Target: WordPress Plugin Popup by Supsystic 1.10.4
Auth required
Prerequisites: Access to WordPress admin panel · Plugin Popup by Supsystic version 1.10.4 installed
MITRE ATT&CK
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Nuclei Templates (1)

Popup by Supsystic <1.10.5 - Cross-Site scripting
MEDIUMby dhiyaneshDK
Shodan: http.html:/wp-content/plugins/popup-by-supsystic
FOFA: body=/wp-content/plugins/popup-by-supsystic

References (2)

Core 2
Core References
Exploit, Third Party Advisory x_refsource_confirm
https://wpscan.com/vulnerability/efdc76e0-c14a-4baf-af70-9d381107308f

Scores

CVSS v3 6.1
EPSS 0.1653
EPSS Percentile 96.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Details

CWE
CWE-79
Status published
Products (1)
supsystic/popup < 1.10.5
Published May 05, 2021
Tracked Since Feb 18, 2026