PT-2018-29: Stored Cross-Site Scripting in Cisco Secure ACS

Vulnerable product

Cisco ACS
Versions: and earlier and earlier


Severity level

Severity level: Medium
Impact: Stored Cross-Site Scripting
Access Vector: Remote

CVSS v3:
Base Score: 5.4
Vector: (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N)

CVE: CVE-2017-6769

Vulnerability description

The specialists of the Positive Research center have detected a Stored Cross-Site Scripting vulnerability in Cisco Secure ACS.

A vulnerability in the web-based management interface of the Cisco Secure Access Control System (ACS), due to insufficient input validation of user-supplied values and a lack of encoding of user-supplied data, could allow an authenticated, remote attacker to conduct a stored cross-site scripting (XSS) attack against a user of the web interface of the affected system.

How to fix

Use vendor's advisory:

Advisory status

01.06.2017 - Vendor gets vulnerability details
26.07.2017 - Vendor releases fixed version and details
13.12.2018 - Public disclosure


The vulnerability was detected by Mikhail Klyuchnikov, Positive Research Center (Positive Technologies Company)


Reports on the vulnerabilities previously discovered by Positive Research:

About Positive Technologies

Positive Technologies is a leading digital security firm with over 15 years of experience in 360° protection of critical IT systems against the most advanced cyberthreats. State-of-the-art solutions are developed at the company's research center—one of the largest in Europe. Positive Technologies experts have helped to identify and fix over 250 zero-day vulnerabilities in products from Cisco, Google, Honeywell, Huawei, Microsoft, Oracle, SAP, Schneider Electric, Siemens, and others, earning a reputation for world-class expertise in protection of devices and infrastructures at all scales from ATMs to nuclear power stations. Findings by Positive Technologies researchers are used for updating the MaxPatrol knowledge base and for development of security solutions including PT Application Firewall, PT Application Inspector, MaxPatrol. These products allow securing web applications, evaluating network protection, blocking attacks in real time, ensuring compliance with industry and national standards, and training security specialists. Positive Technologies is the organizer of the annual Positive Hack Days international forum and security competition.