CVE-2026-119744
Cendio ThinLinc Improper Authentication via Web Access
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-290 |
| Vendor | cendio |
| Product | thinlinc |
| Published | Nov 5, 2026 |
| Last Updated | Nov 5, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Cendio / ThinLinc
4.1.0 < 4.15.1 4.16.0 < 4.16.1 4.17.0 < 4.17.1 4.18.0 < 4.18.1 4.19.0 < 4.19.1 4.20.0 < 4.20.1
References
community.thinlinc.com: https://community.thinlinc.com/t/thinlinc-4-15-1-through-4-20-1-security-release/1985 community.thinlinc.com: https://community.thinlinc.com/t/urgent-thinlinc-security-issue/1970 vulncheck.com: https://www.vulncheck.com/advisories/cendio-thinlinc-improper-authentication-via-web-access
Credits
Cosmikal S.L.