CVE-2021-47931

MEDIUM

Exponent CMS 2.6 Text Editing Endpoint - Stored Cross-Site Scripting

Title source: manual
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-47931. PoCs published by heinjame.

AI-analyzed exploit summary The exploit demonstrates multiple vulnerabilities in Exponent CMS 2.6, including stored XSS, database credential disclosure, and authentication brute-forcing. It includes functional code for brute-forcing usernames and passwords, as well as a payload for XSS.

Description

Exponent CMS 2.6 contains a stored cross-site scripting vulnerability that allows authenticated attackers to inject malicious scripts through the Title and Text Block parameters in the text editing endpoint. Attackers can inject iframe payloads with embedded SVG onload events to execute arbitrary JavaScript. The application also exposes database credentials in responses and lacks brute-force protection on authentication endpoints.

Exploits (1)

exploitdb WORKING POC
by heinjame · textwebappsphp
https://www.exploit-db.com/exploits/50611

The exploit demonstrates multiple vulnerabilities in Exponent CMS 2.6, including stored XSS, database credential disclosure, and authentication brute-forcing. It includes functional code for brute-forcing usernames and passwords, as well as a payload for XSS.

Classification
Working Poc 90%
Attack Type
Xss | Info Leak | Auth Bypass
Complexity
Moderate
Reliability
Reliable
Target: Exponent CMS <=2.6
No auth needed
Prerequisites: access to the target URL · username and password lists for brute-forcing
devstral-2 · analyzed May 10, 2026 Full analysis →

References (3)

Core 3
Core References
Exploit exploit
ExploitDB-50611
https://www.exploit-db.com/exploits/50611
Product product
Official Product Homepage
https://www.exponentcms.org/
Third Party Advisory third-party-advisory
VulnCheck Advisory: Exponent CMS 2.6 Multiple Vulnerabilities Stored XSS Authentication
https://www.vulncheck.com/advisories/exponent-cms-multiple-vulnerabilities-stored-xss-authentication

Scores

CVSS v3 6.4
EPSS 0.0021
EPSS Percentile 11.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/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)
Exponentcms/Exponent CMS < 2.6
Published May 10, 2026
Tracked Since May 10, 2026