CVE-2021-24276

MEDIUM NUCLEI

Contact Form by Supsystic < 1.7.15 - Reflected Cross-Site Scripting via Tab Parameter

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-24276. PoCs published by 0xB9. A Nuclei detection template is also available.

AI-analyzed exploit summary This exploit demonstrates a reflected XSS vulnerability in the Contact Form by Supsystic WordPress plugin (version 1.7.14) via the unsanitized 'tab' parameter in the admin page. The PoC uses a crafted URL to trigger an XSS payload via CSS animation events.

Description

The Contact Form by Supsystic WordPress plugin before 1.7.15 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/50344

This exploit demonstrates a reflected XSS vulnerability in the Contact Form by Supsystic WordPress plugin (version 1.7.14) via the unsanitized 'tab' parameter in the admin page. The PoC uses a crafted URL to trigger an XSS payload via CSS animation events.

Classification
Working Poc 100%
Attack Type
Xss
Complexity
Trivial
Reliability
Reliable
Target: Contact Form by Supsystic WordPress plugin < 1.7.15
Auth required
Prerequisites: Access to WordPress admin panel · Victim interaction (clicking malicious link)
MITRE ATT&CK
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Nuclei Templates (1)

WordPress Supsystic Contact Form <1.7.15 - Cross-Site Scripting
MEDIUMby dhiyaneshDK
Shodan: http.html:/wp-content/plugins/contact-form-plugin/
FOFA: body=/wp-content/plugins/contact-form-plugin/

References (2)

Core 2
Core References
Exploit, Third Party Advisory x_refsource_confirm
https://wpscan.com/vulnerability/1301123c-5e63-432a-ab90-3221ca532d9c

Scores

CVSS v3 6.1
EPSS 0.1611
EPSS Percentile 96.5%
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/contact_form < 1.7.15
Published May 05, 2021
Tracked Since Feb 18, 2026