# CVE-2026-119744: Cendio ThinLinc Improper Authentication via Web Access

Status: published. Published: 2026-11-05. Updated: 2026-11-05.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://community.thinlinc.com/t/thinlinc-4-15-1-through-4-20-1-security-release/1985

## Affected products and versions

- Cendio / ThinLinc: ≥ 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). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 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; source: CNA: VulnCheck

- CVSS 3.1: 8.8 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-290

## 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/1985 (CNA: VulnCheck; release-notes, patch)

- https://community.thinlinc.com/t/urgent-thinlinc-security-issue/1970 (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/cendio-thinlinc-improper-authentication-via-web-access (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-119744; retrieved 2026-11-05; source updated 2026-11-05

Revision: 320b265a021d772d558613d34e7583da18389b5c1f7f2a442da1cf2dffc242d6

Canonical: https://y2.dev/cve/CVE-2026-119744

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