Cisco Webex App
CVE-2026-20178
MEDIUM
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Network-delivered redirect requires user click (UI:R), no attacker auth needed (PR:N), scope unchanged, with only limited integrity impact and no confidentiality or availability consequence.
Primary rating from Vendor (cisco).
CVSS VectorVendor: cisco
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Lifecycle Timeline
2DescriptionCVE.org
A vulnerability in the browser-based version of Cisco Webex App could have allowed an unauthenticated, remote attacker to redirect users to a malicious webpage. Cisco has addressed this vulnerability in the Cisco Webex App, and no customer action is needed. This vulnerability existed due to improper input validation of URL parameters in an HTTP request. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by persuading a user to click a crafted URL. A successful exploit could have allowed the attacker to redirect a user to a malicious website.
AnalysisAI
Open redirect in the browser-based Cisco Webex App allowed unauthenticated remote attackers to redirect users to attacker-controlled websites by crafting malicious URLs with manipulated parameters. The vulnerability (CWE-601) stems from improper input validation of URL parameters in HTTP requests and scores CVSS 4.3 Medium (AV:N/AC:L/PR:N/UI:R). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target user be accessing the browser-based version of Cisco Webex App specifically - native desktop and mobile clients are not affected. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N accurately characterizes the risk profile: network-reachable, low attack complexity, no attacker privileges required, mandatory user interaction, no scope change, and limited integrity impact with no confidentiality or availability consequence. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a URL pointing to the legitimate Cisco Webex App browser interface but embeds a manipulated redirect parameter targeting a phishing or malware-hosting site, then distributes this URL via email, messaging, or social media. A victim, recognizing the trusted webex.com domain, clicks the link and is silently forwarded to the attacker's site without any browser warning. … |
| Remediation | Cisco has fully remediated this vulnerability server-side; no patch deployment, configuration change, or upgrade is required from customers or administrators. … Detailed patch versions, workarounds, and compensating controls in full report. |
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