What is the CVSS score of CVE-2021-47808?

CVE-2021-47808 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Cotonti Siena are affected by CVE-2021-47808?

Organizations using Cotonti Siena 0.9.19 should be aware of moderate risk from CVE-2021-47808, a cross-site scripting vulnerability rated CVSS 5.4.

Is there a public PoC exploit available for CVE-2021-47808?

Yes, a public proof-of-concept exploit is available for CVE-2021-47808. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2021-47808?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Cotonti Siena CVE-2021-47808

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-01-16 disclosure@vulncheck.com

XSS Cotonti Siena Cotonti

5.4

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.4 MEDIUM

AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Feb 02, 2026 - 16:16 vuln.today

Public exploit code

CVE Published

Jan 16, 2026 - 00:16 nvd

MEDIUM 5.4

DescriptionCVE.org

Cotonti Siena 0.9.19 contains a stored cross-site scripting vulnerability in the admin configuration panel's site title parameter. Attackers can inject malicious JavaScript code through the 'maintitle' parameter to execute scripts when administrators view the page.

AnalysisAI

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Cotonti Siena. Cotonti Siena 0.9.19 contains a stored cross-site scripting vulnerability in the admin configuration panel's site title parameter. Attackers can inject malicious JavaScript code through the 'maintitle' parameter to execute scripts when administrators view the page.

RemediationAI

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.