VulnerabilityPublished 25 Mar 2026Updated 27 Mar 2026

CVE-2026-20108: Cisco Catalyst SD-WAN Manager · Cross-site Scripting

Affects Cisco Catalyst SD-WAN ManagerSource CVE Database V5

Compare

Not known to be exploited · CVSS 5.4 Medium.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score

5.4Medium

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

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% 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 25 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 Catalyst SD-WAN Manager	Affected 20.12.1 – 20.18.1 24 affected builds	Fixed in–

AI-suggested

Until an official fix is available, users should exercise caution with links received in the management interface context and limit authenticated access to trusted users only.

Description

CVE-2026-20108 is a medium severity cross-site scripting (XSS) vulnerability in the web-based management interface of Cisco Catalyst SD-WAN Manager. It allows an authenticated remote attacker to execute arbitrary script code by persuading a user to click a crafted link due to insufficient input validation. This could lead to unauthorized access to sensitive browser-based information within the interface. The vulnerability affects multiple versions of Cisco Catalyst SD-WAN Manager released before the publication date. There is no explicit information about an available patch or vendor advisory in the provided data.

Impact

Successful exploitation allows an attacker with authenticated access to execute arbitrary scripts in the context of the web interface user, potentially leading to disclosure of sensitive browser-based information. The impact is limited to confidentiality and integrity with no availability impact. There are no known exploits in the wild as of the published date.

Summary

This vulnerability in Cisco Catalyst SD-WAN Manager's web interface arises from improper neutralization of user input during web page generation, enabling an authenticated remote attacker to conduct a cross-site scripting attack. Exploitation requires user interaction (clicking a crafted link) and could result in execution of arbitrary script code in the context of the affected interface, potentially exposing sensitive information. The CVSS 3.1 base score is 5.4 (medium), reflecting network attack vector, low attack complexity, required privileges, and user interaction. Multiple versions from 20.12.1 through 20.18.1 are affected.

References

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vmanage-xss-ZqkhP9W9 (opens in a new tab)

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 3 Apr 2026, 13:38 UTC

Technical details

References

Community reviews

Related threats