CVE-2026-20055VulnerabilityPublished 21 Jan 2026

CVE-2026-20055: Cisco Packaged Contact Center Enterprise · Cross-site Scripting

Affects Cisco Packaged Contact Center EnterpriseSource CVE Database V5

Not known to be exploited · CVSS 4.8 Medium.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score

4.8Medium

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: High
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: High: The attacker is authorized with (i.e., requires) privileges that provide significant (e.g., administrative) control over the vulnerable component that could affect component-wide settings and files.
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 21 Jan 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 2026-10-26.

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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC 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 Packaged Contact Center Enterprise	Affected =12.5(1) =11.0(1) =12.0(1) =11.0(2) =11.5(1) =10.5(1) =10.5(2) =11.6(2) =10.5(1)_ES7 =11.6(1) =10.5(2)_ES8 =12.6(1) =12.5(2) =12.6(2) =15.0(1)	Fixed in–
CiscoCisco Unified Contact Center Enterprise	Affected =10.5 =11.0 =11.5	Fixed in–

AI-suggested

1. Immediately restrict administrative access to the web-based management interface using network segmentation and VPNs to limit exposure. 2. Enforce strong, multi-factor authentication (MFA) for all administrative accounts to reduce the risk of credential compromise. 3. Apply the latest patches and updates from Cisco as soon as they become available to remediate the vulnerability. 4. Implement strict input validation and sanitization on the management interface to prevent injection of malicious scripts. 5. Monitor administrative access logs and web interface activity for unusual behavior indicative of exploitation attempts. 6. Conduct regular security awareness training for administrators to recognize phishing or social engineering attempts that could lead to credential theft. 7. Consider deploying web application firewalls (WAFs) with rules tailored to detect and block XSS payloads targeting the management interface. 8. Review and minimize the number of users with administrative privileges to reduce the attack surface. 9. Perform periodic security assessments and penetration testing focused on the contact center management infrastructure. 10. Establish incident response plans specifically addressing potential exploitation of management interface vulnerabilities.

Description

Multiple vulnerabilities in the web-based management interface of Cisco Packaged Contact Center Enterprise (Packaged CCE) and Cisco Unified Contact Center Enterprise (Unified CCE) could allow an authenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the web-based management interface of an affected device.  These vulnerabilities exist because the web-based management interface does not properly validate user-supplied input. An attacker could exploit these vulnerabilities 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. To exploit these vulnerabilities, the attacker must have valid administrative credentials.

Impact

For European organizations, the impact of CVE-2026-20055 can be significant, especially for those relying on Cisco Packaged CCE or Unified CCE for customer contact management. Successful exploitation could lead to unauthorized disclosure of sensitive configuration data, session hijacking, or manipulation of contact center operations through the management interface. This could disrupt customer service, lead to data breaches involving customer or employee information, and damage organizational reputation. Given the requirement for administrative credentials, the threat is heightened in environments with weak credential management or insider threats. The confidentiality and integrity of contact center management data are at risk, potentially affecting compliance with European data protection regulations such as GDPR. Additionally, contact centers often handle sensitive personal data, making them attractive targets for attackers. The medium severity rating suggests a moderate but non-trivial risk that should be addressed promptly to prevent escalation or lateral movement within networks.

References

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucce-pcce-xss-2JVyg3uD (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 21 Jan 2026, 16:51 UTC

Technical details

References

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