CVE-2021-40303

MEDIUM

perfex_crm 1.10 - Cross-Site Scripting via /clients/profile

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 2 public exploits for CVE-2021-40303. PoCs published by Alhasan Abbas, zecopro.

AI-analyzed exploit summary This exploit demonstrates a stored XSS vulnerability in perfexcrm 1.10 by injecting malicious JavaScript into the 'state' parameter of a profile update request. The payload is executed when another user views the profile page.

Description

perfex crm 1.10 is vulnerable to Cross Site Scripting (XSS) via /clients/profile.

Exploits (2)

exploitdb WORKING POC
by Alhasan Abbas · textwebappsmultiple
https://www.exploit-db.com/exploits/50097

This exploit demonstrates a stored XSS vulnerability in perfexcrm 1.10 by injecting malicious JavaScript into the 'state' parameter of a profile update request. The payload is executed when another user views the profile page.

Classification
Working Poc 90%
Attack Type
Xss
Complexity
Trivial
Reliability
Reliable
Target: perfexcrm 1.10
Auth required
Prerequisites: Valid session cookie (sp_session) · Access to the profile update page
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WORKING POC 2 stars
by zecopro · poc
https://github.com/zecopro/CVE-2021-40303

The repository contains a functional proof-of-concept for CVE-2021-40303, demonstrating a stored XSS vulnerability in Perfex CRM 1.10 via the `/clients/profile` endpoint. The PoC includes a crafted HTTP POST request with malicious input in the `state` parameter, which triggers an XSS payload when the profile page is viewed.

Classification
Working Poc 95%
Attack Type
Xss
Complexity
Trivial
Reliability
Reliable
Target: Perfex CRM 1.10
Auth required
Prerequisites: Access to a valid session cookie for an authenticated user
devstral-2 · analyzed Feb 19, 2026 Full analysis →

References (1)

Core 1
Core References
Exploit, Third Party Advisory, VDB Entry
https://www.exploit-db.com/exploits/50097

Scores

CVSS v3 5.4
EPSS 0.0050
EPSS Percentile 39.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (1)
perfexcrm/perfex_crm 1.10
Published Nov 08, 2022
Tracked Since Feb 18, 2026