CVE-2026-119744
Cendio ThinLinc Improper Authentication via Web Access
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.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| ThinLinc Cendio |
≥ 4.1.0; < 4.15.1 (affected, semver) ≥ 4.16.0; < 4.16.1 (affected, semver) ≥ 4.17.0; < 4.17.1 (affected, semver) ≥ 4.18.0; < 4.18.1 (affected, semver) ≥ 4.19.0; < 4.19.1 (affected, semver) ≥ 4.20.0; < 4.20.1 (affected, semver) Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 7.7 high |
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | CNA: VulnCheck |
| 3.1 / 8.8 high |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | CNA: VulnCheck |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://community.thinlinc.com/t/thinlinc-4-15-1-through-4-20-1-security-release/1985CNA: VulnCheck · release-notes, patch
- https://community.thinlinc.com/t/urgent-thinlinc-security-issue/1970CNA: VulnCheck · vendor-advisory
- https://www.vulncheck.com/advisories/cendio-thinlinc-improper-authentication-via-web-accessCNA: VulnCheck · third-party-advisory
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