Stored Cross-Site Scripting Vulnerability in Exponent CMS by Exponent
CVE-2021-47931

5.1MEDIUM

Key Information:

Vendor

Exponentcms

Status
Exponent Cms
Vendor
CVE Published:
10 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47931?

Exponent CMS version 2.6 is susceptible to a stored cross-site scripting vulnerability that enables authenticated attackers to inject malicious scripts through the Title and Text Block parameters in the text editing endpoint. This flaw permits the insertion of iframe payloads that can execute arbitrary JavaScript via embedded SVG onload events. Additionally, the application inadvertently exposes sensitive database credentials in its responses and lacks adequate brute-force protection on authentication endpoints, thereby further compromising its security.

Affected Version(s)

Exponent CMS 0 <= 2.6

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-47931 - Proof of Concept

References

https://www.exploit-db.com/exploits/50611
exploit
https://www.exponentcms.org/
product
https://www.vulncheck.com/advisories/exponent-cms-multipl...
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

picaro_o
.