VulnerabilityPublished 11 Mar 2026

CVE-2026-20117: Cisco Unified Contact Center Express · Cross-site Scripting

Affects Cisco Unified Contact Center ExpressSource CVE Database V5

Compare

Not known to be exploited · CVSS 6.1 Medium.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score

6.1Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Changed
Confidentiality: Low
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 11 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
CiscoCisco Unified Contact Center Express	Affected =1501_ES01_CSCws06843	Fixed in–

AI-suggested

Organizations should immediately assess their Cisco Unified Contact Center Express deployments to identify affected versions. Cisco typically releases patches or updates to address such vulnerabilities; applying the latest security updates is the most effective mitigation. If patches are not yet available, administrators should restrict access to the web-based management interface using network segmentation, VPNs, or IP whitelisting to limit exposure to trusted personnel only. Implementing web application firewalls (WAFs) with custom rules to detect and block suspicious input patterns can help mitigate exploitation attempts. Educate administrators and users to recognize phishing attempts and suspicious links that could trigger XSS payloads. Additionally, enabling Content Security Policy (CSP) headers on the management interface can reduce the risk of script injection exploitation. Regularly monitor logs for unusual activity or repeated access attempts to the management interface. Finally, consider multi-factor authentication (MFA) for administrative access to reduce the risk of session hijacking post-exploitation.

Description

A vulnerability in the web-based management interface of Cisco Unified Contact Center Express (Unified CCX) could allow an unauthenticated, remote attacker to conduct cross-site scripting (XSS) attacks against a user of the interface. This vulnerability exists because the web-based management interface of an affected system does not sufficiently validate user-supplied input. An attacker could exploit this vulnerability by injecting malicious code into specific pages of the interface. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.

Impact

The impact of CVE-2026-20117 is primarily on confidentiality and integrity within organizations using Cisco Unified Contact Center Express. Successful exploitation could allow attackers to execute arbitrary scripts in the context of the management interface, potentially leading to theft of administrative session tokens, credentials, or sensitive configuration data. This could enable further compromise of the contact center environment or pivoting into broader enterprise networks. Since the vulnerability requires user interaction, the risk is somewhat mitigated but remains significant given the critical role of contact center systems in customer communications and data handling. Exploitation could disrupt trust in customer interactions, lead to data leakage, or facilitate social engineering attacks. The broad range of affected versions and the common use of Cisco Unified CCX in large enterprises worldwide increase the potential attack surface. While availability is not impacted, the confidentiality breach could have regulatory and reputational consequences, especially in sectors handling sensitive customer data such as finance, healthcare, and telecommunications.

References

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cc-xss-MrNAH5Jh (opens in a new tab)

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 11 Mar 2026, 17:16 UTC

Technical details

References

Community reviews

Related threats