CVE-2026-23563
Teamviewer Digital Employee Experience ≤ 26.1
Raw vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:H/A:HSummary
CVE-2026-23563 is a medium-severity Link Following (CWE-59) vulnerability in Teamviewer Digital Employee Experience. Its CVSS base score is 5.7 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Path Interception (T1034); ranked at the 9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to AC-3 (Access Enforcement) and AC-6 (Least Privilege) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2026-23563 is an Improper Link Resolution Before File Access vulnerability in TeamViewer DEX - 1E Client versions before 26.1 on Windows. The issue arises in the 1E-Explorer-TachyonCore-DeleteFileByPath instruction, where the software follows crafted RPC control junctions or symlinks without proper resolution checks prior to file access, enabling deletion of protected system files. Published on 2026-01-29, it is rated with a CVSS v3.1 base score of 5.7 (AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:H/A:H) and maps to CWE-59.
A low-privileged local attacker can exploit this vulnerability by crafting an RPC control junction or symlink that is followed when the delete instruction executes, resulting in the deletion of protected system files. Although the description specifies a low-privileged local attacker, the CVSS vector indicates requirements for high privileges (PR:H), network attack vector (AV:N) with high complexity (AC:H), and user interaction (UI:R), leading to high impacts on integrity (I:H) and availability (A:H) with no confidentiality impact (C:N).
TeamViewer has published security bulletin TV-2026-1002 at https://www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1002/, which addresses the vulnerability.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-4980
Vulnerability Data
Improper Link Resolution Before File Access (invoked by 1E‑Explorer‑TachyonCore‑DeleteFileByPath instruction) in TeamViewer DEX - 1E Client before version 26.1 on Windows allows a low‑privileged local attacker to delete protected system files via a crafted RPC control junction or symlink that…
more
is followed when the delete instruction executes.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
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V15.4.2
Mitigating Controls (NIST 800-53 r5) AI
Proper enforcement of access authorizations on the resolved target resource stops a link from reaching an unintended object.
Least-privilege limits the damage an attacker can cause after following an unintended link.
Validating file-name inputs can reject or canonicalize names that resolve to links before access occurs.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Secure SDLC practices directly require code to validate paths and avoid unsafe link following.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Security testing can detect link-following flaws before release.
Secure SDLC practices can mandate link-resolution checks and canonicalization before file access.
Application security requirements can explicitly require safe handling of symbolic links and path traversal.
Secure architecture principles include input validation and safe file-access design patterns.
Secure coding standards directly address canonicalization and symlink attacks during implementation.
Access-control rules can limit which files are reachable, reducing exposure to malicious links.