VulnerabilityPublished 11 Mar 2026

CVE-2026-20116: Cisco Unified Contact Center Express · Cross-site Scripting

Affects Cisco Unified Contact Center ExpressSource CVE Database V5

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Not known to be exploited · CVSS 6.1 Medium.

Data as of 29 Oct 2026, 19:04 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 29 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 deployment of Cisco Unified Contact Center products and identify affected versions. The primary mitigation is to apply official patches or updates from Cisco as soon as they become available. In the absence of patches, organizations should restrict access to the web-based management interfaces by implementing network segmentation, firewall rules, and VPN access to limit exposure to trusted users only. Employing web application firewalls (WAFs) with custom rules to detect and block malicious input patterns can help mitigate exploitation attempts. Additionally, enforcing strong Content Security Policy (CSP) headers can reduce the impact of injected scripts. User training to recognize suspicious links or interface anomalies can reduce successful user interaction exploitation. Regularly auditing and monitoring logs for unusual access patterns or script injection attempts is recommended. Finally, Cisco customers should subscribe to Cisco security advisories to stay informed about updates and exploit developments.

Description

A vulnerability in the web-based management interface of  Cisco Finesse, Cisco Packaged Contact Center Enterprise (Packaged CCE), Cisco Unified Contact Center Enterprise (Unified CCE), Cisco Unified Contact Center Express (Unified CCX), and Cisco Unified Intelligence Center 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 primary impact of this vulnerability is the potential compromise of confidentiality and integrity within the Cisco contact center management environment. An attacker exploiting this XSS flaw can execute arbitrary scripts in the context of the victim's browser, which may lead to theft of session cookies, credentials, or other sensitive information accessible via the browser. This can facilitate further attacks such as session hijacking, unauthorized access, or phishing within the organization. Given that contact center platforms often handle sensitive customer data and call routing controls, compromise could disrupt business operations or lead to data leakage. The vulnerability does not directly affect system availability but could indirectly impact operational continuity if exploited at scale. Organizations worldwide using affected Cisco products, especially those with web interfaces exposed to untrusted networks, face increased risk of targeted attacks. The broad range of affected versions and the critical role of these platforms in customer service operations amplify the potential impact.

References

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

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Exploitation evidence

What to do

Affected software

Description

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

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