Security readout for executives and security teams
Plain-English summary
CVE-2026-23563 affects TeamViewer DEX 1E Client on Windows before version 26.1. A low-privileged attacker could abuse file-link handling to make a privileged delete operation remove protected system files. This is not reported as actively exploited in the provided sources.
Executive priority
Treat as a timely patching item, not an emergency. The business risk is endpoint disruption or system damage if a local attacker abuses privileged file deletion. Prioritize remediation on shared workstations, high-value endpoints, and environments with many local users.
Technical view
The flaw is CWE-59: improper link resolution before file access in the 1E-Explorer-TachyonCore-DeleteFileByPath instruction. A crafted RPC control junction or symlink may be followed when deletion executes, allowing protected system file deletion. CVSS is 5.7 medium with high attack complexity, high privileges, and user interaction indicated.
Likely exposure
Organizations using TeamViewer DEX 1E Client on Windows before version 26.1 are potentially exposed. The provided affected metadata is limited and somewhat inconsistent, so confirm applicability against TeamViewer’s bulletin and endpoint inventory.
Exploitation context
The source description requires a low-privileged local attacker and crafted link/junction conditions. The CVSS vector also indicates high complexity, high privileges, and user interaction. No CISA KEV listing or cited source indicates active exploitation.
Researcher notes
The CVE description says local low-privileged attacker, while the CVSS vector lists AV:N/PR:H/UI:R. Use the vendor bulletin as the primary applicability source. The provided sources do not include exploit evidence, detailed attack prerequisites, or compensating controls beyond updating.
Mitigation direction
- Upgrade TeamViewer DEX 1E Client on Windows to version 26.1 or later.
- Review TeamViewer security bulletin TV-2026-1002 for product-specific guidance.
- Prioritize systems where low-privileged users can access affected client functionality.
- Restrict unnecessary local user access on endpoints pending remediation.
Validation and detection
- Inventory Windows endpoints running TeamViewer DEX 1E Client.
- Verify installed 1E Client versions are 26.1 or later.
- Check whether the vulnerable DeleteFileByPath instruction is present in deployed versions.
- Review endpoint logs for unusual protected file deletion attempts.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-59: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-23563 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:H/A:H0.55.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.7MediumVector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:H/A:H
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Link Resolution Before File Access ('Link Following')
Improper Link Resolution Before File Access ('Link Following') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.