CVE-2025-20328VulnerabilityPublished 3 Sep 2025

CVE-2025-20328: Cisco Webex Meetings · Cross-site Scripting

Affects Cisco Webex MeetingsSource CVE Database V5

Not known to be exploited · CVSS 5.4 Medium.

Data as of 26 Oct 2026, 08:30 UTC

CVSS 3.1 base score

5.4Medium

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:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
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: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
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 3 Sep 2025
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 26 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.
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

AI-suggested

Although Cisco has addressed this vulnerability on their service side, European organizations should take proactive steps to mitigate residual risks: 1) Educate users about the risks of clicking unsolicited or suspicious links within Webex Meetings or related communications to reduce the likelihood of successful phishing attempts exploiting this XSS. 2) Monitor Webex Meetings usage and logs for unusual activity that could indicate exploitation attempts, such as unexpected script execution or anomalous user behavior. 3) Ensure that all Webex Meetings clients and integrations are updated to the latest versions to benefit from vendor patches and security improvements. 4) Implement Content Security Policy (CSP) headers and other browser security controls where possible to limit the impact of potential XSS attacks. 5) For organizations using custom or on-premises Webex deployments, verify that patches addressing this vulnerability have been applied. 6) Employ multi-factor authentication (MFA) to reduce the risk posed by compromised credentials resulting from XSS attacks. 7) Regularly review and restrict user privileges within Webex Meetings to the minimum necessary, limiting the ability of low-privilege attackers to exploit such vulnerabilities.

Description

A vulnerability in the user profile component of Cisco Webex Meetings could have allowed an authenticated, remote attacker with low privileges to conduct a cross-site scripting (XSS) attack against a user of the web-based interface. Cisco has addressed this vulnerability in the Cisco Webex Meetings service, and no customer action is needed. This vulnerability existed because of insufficient validation of user-supplied input to the user profile component of Cisco Webex Meetings. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by persuading a user of the interface to click a crafted link. A successful exploit could have allowed the attacker to conduct an XSS attack against the targeted user.

Impact

For European organizations, this vulnerability poses a risk primarily to confidentiality and integrity of user data within Cisco Webex Meetings, a widely used collaboration platform. Successful exploitation could allow attackers to hijack user sessions, steal sensitive meeting information, or manipulate meeting-related data, potentially leading to unauthorized disclosure or alteration of confidential communications. Given the reliance on Webex Meetings for remote work, especially in sectors like finance, healthcare, and government, exploitation could disrupt trust and confidentiality of communications. However, the requirement for attacker authentication and user interaction limits the ease of exploitation. The fact that Cisco has already remediated the issue on their service reduces immediate risk, but organizations should remain vigilant, especially those with custom integrations or on-premises deployments if applicable. The vulnerability does not affect availability, so disruption of service is unlikely. Overall, the impact is moderate but significant enough to warrant attention in environments where sensitive or regulated data is handled via Webex Meetings.

References

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-xss-55bv8hhm (opens in a new tab)

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 3 Sep 2025, 18:03 UTC

Technical details

References

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