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CVE-2021-47931: Exponent CMS 2.6 Multiple Vulnerabilities Stored XSS Authentication

• Severity: medium (CVSS 6.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-10 · updated 2026-07-25
• Weakness: CWE-79

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.

Affected products

• Exponent CMS: through 2.6

References

• https://www.exploit-db.com/exploits/50611
• https://www.exponentcms.org/
• https://www.vulncheck.com/advisories/exponent-cms-multiple-vulnerabilities-stored-xss-authentication

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