CVE-2015-20117

MediumPublic PoC

Published: 16 March 2026

Published

16 March 2026

Modified

19 March 2026

KEV Added

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Patch

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CVSS Score 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS Score 0.0013 32.4th percentile

Risk Priority 11 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2015-20117 is a medium-severity CSRF (CWE-352) vulnerability in Nextclickventures Realtyscript. Its CVSS base score is 5.3 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 32.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 SC-23 (Session Authenticity) and SI-10 (Information Input Validation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190). What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SC-23 Session Authenticity good match

prevent

SC-23 requires mechanisms to protect session authenticity, such as CSRF tokens, directly preventing forged requests to /admin/addusers.php and /admin/editadmins.php endpoints.

SI-10 Information Input Validation good match

prevent

SI-10 mandates validation of information inputs, including CSRF tokens and form data, to block malicious submissions that create unauthorized users.

AC-2 Account Management partial match

preventdetectrespond

AC-2 enforces account management processes, including approval and review of new accounts, to prevent, identify, and disable unauthorized SUPERUSER accounts created via CSRF.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

Why these techniques?

CSRF vulnerability in public-facing web application admin endpoints enables unauthenticated remote exploitation to create accounts or escalate privileges, directly mapping to T1190: Exploit Public-Facing Application.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

NVD Description

Next Click Ventures RealtyScript 4.0.2 contains a cross-site request forgery vulnerability that allows unauthenticated attackers to create unauthorized user accounts and administrative users by crafting malicious forms. Attackers can submit hidden form data to /admin/addusers.php and /admin/editadmins.php endpoints to register…

new users with arbitrary credentials and escalate privileges to SUPERUSER level.

Deeper analysisAI

CVE-2015-20117 is a cross-site request forgery (CSRF) vulnerability, classified under CWE-352, in Next Click Ventures RealtyScript version 4.0.2. The flaw resides in the /admin/addusers.php and /admin/editadmins.php endpoints, which lack proper CSRF protections, enabling attackers to submit hidden form data for unauthorized actions.

Unauthenticated attackers can exploit this vulnerability over the network with low complexity and no privileges required, as indicated by its CVSS v3.1 base score of 5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N). By crafting malicious forms, they can trick victims into creating new user accounts with arbitrary credentials or escalate privileges to SUPERUSER level, potentially gaining administrative control.

Advisories detailing the issue include Exploit-DB (https://www.exploit-db.com/exploits/38496), VulnCheck (https://www.vulncheck.com/advisories/realtyscript-cross-site-request-forgery-unauthorized-user-creation), and Zero Science (https://www.zeroscience.mk/en/vulnerabilities/ZSL-2015-5269.php). No patch or mitigation details are specified in the CVE description.