CVE-2026-119744— Cendio ThinLinc Improper Authentication via Web Access

Quick assessment

Affected

Cendio ThinLinc

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cendio ThinLinc 的基于浏览器的 Web 客户端（tlwebaccess）存在身份验证不当漏洞。该漏洞允许已认证的攻击者利用多步骤身份验证流程中的缺陷（例如一次性密码、登录横幅或密码过期提示），冒充任何其他用户（包括 root 用户）。攻击者可在多步骤登录过程中利用此身份验证绕过机制，获取对其他用户账户（含管理员权限）的未授权访问。该漏洞影响 ThinLinc 4.1.0 至 4.20.0 版本。

CVSS 8.8 · High Updated Nov 06, 2026

Possible ATT&CK Techniques 2 AI

T1078.004 · Cloud Accounts T1110.004 · Credential Stuffing

Affected Version Matrix 6

Vendor	Product	Version Range	Status
Cendio	ThinLinc	`4.1.0< 4.15.1`	affected
		`4.16.0< 4.16.1`	affected
		`4.17.0< 4.17.1`	affected
		`4.18.0< 4.18.1`	affected
		`4.19.0< 4.19.1`	affected
		`4.20.0< 4.20.1`	affected

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Vulnerability Information

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Vulnerability Title

Cendio ThinLinc Improper Authentication via Web Access

Source: CVE Program / CVE List V5

Vulnerability Description

Cendio ThinLinc contains an improper authentication vulnerability in its browser-based web client (tlwebaccess) that allows an authenticated attacker to impersonate any other user, including root, by exploiting flaws in multi-step authentication flows such as one-time passwords, login banners, or expired password prompts. Attackers can leverage this authentication bypass during the multi-step login process to gain unauthorized access to other user accounts, including administrative privileges, in versions from 4.1.0 through 4.20.0.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

使用欺骗进行的认证绕过

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Cendio	ThinLinc	4.1.0 ~ 4.15.1	-

II. Public POCs for CVE-2026-119744

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-119744

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Other References for CVE-2026-119744 (3)

https://community.thinlinc.com/t/urgent-thinlinc-security-issue/1970 vendor-advisory
https://community.thinlinc.com/t/thinlinc-4-15-1-through-4-20-1-security-release/1985 release-notes patch
https://www.vulncheck.com/advisories/cendio-thinlinc-improper-authentication-via-web-access third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-119744

IV. Related Vulnerabilities

Same weakness: CWE-290