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A vulnerability in the Lobby Ambassador web-based management API of Cisco IOS XE Software could allow an authenticated, remote attacker to elevate their privileges and access management APIs that would not normally be available for Lobby Ambassador users. 
 This vulnerability exists because parameters that are received by an API endpoint are not sufficiently validated. An attacker could exploit this vulnerability by authenticating as a Lobby Ambassador user and sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to create a new user with privilege level 1 access to the web-based management API. The attacker would then be able to access the device with these new credentials and privileges.

CVE-2026-20114 is a vulnerability identified in the Lobby Ambassador web-based management API component of Cisco IOS XE Software. The root cause is improper validation of syntactic correctness of input parameters received by an API endpoint. Specifically, parameters sent to the API are not sufficiently validated, enabling an attacker who is authenticated as a Lobby Ambassador user to craft malicious HTTP requests. These crafted requests can exploit the input validation flaw to escalate privileges by creating a new user account with privilege level 1 access to the web-based management API. This privilege level allows the attacker to gain broader access to the device management functions than normally permitted for Lobby Ambassador users. The vulnerability affects a broad range of Cisco IOS XE versions spanning from 16.11.1 to 17.18.1a, indicating a long-standing issue across multiple releases. The CVSS 3.1 base score is 5.4 (medium severity), reflecting the requirement for authentication but the potential for privilege escalation and limited confidentiality and integrity impact. There is no indication of known exploits in the wild at this time. The vulnerability does not require user interaction beyond authentication, and the attack vector is network-based (remote). The scope is limited to devices running affected Cisco IOS XE versions with the Lobby Ambassador feature enabled. This vulnerability could be leveraged by insiders or attackers who have obtained Lobby Ambassador user credentials to gain unauthorized management access.

Detailed information about CVE-2026-20114: Improper Validation of Syntactic Correctness of Input in Cisco Cisco IOS XE Software affecting Cisco Cisco IOS XE Sof

CVE-2026-20114: Improper Validation of Syntactic Correctness of Input in Cisco Cisco IOS XE Software - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-20114: Improper Validation of Syntactic Correctness of Input in Cisco Cisco IOS XE Software

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