Wyse Proprietary OS (Modern ThinOS): Improper Neutralization of Special Elements used in a Command
CVE-2025-26331 is a high-severity improper neutralization of special elements used in a command vulnerability in Wyse Proprietary OS (Modern ThinOS) from Dell, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists version ThinOS 2502 as the first without the flaw, so updating Wyse Proprietary OS (Modern ThinOS) to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.6% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Wyse Proprietary OS (Modern ThinOS) to ThinOS 2502 or a later version.
- Read the advisory on dell.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Dell | Wyse Proprietary OS (Modern ThinOS) | before ThinOS 2502 | ThinOS 2502 |
| Dell | Thinos | 2411 and earlier | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (emc.com).
Official description
Dell ThinOS 2411 and prior, contains an Improper Neutralization of Special Elements used in a Command ('Command Injection') vulnerability. A low privileged attacker with local access could potentially exploit this vulnerability, leading to arbitrary code execution.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Neutralization of Special Elements used in a Command
The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.
How developers prevent this class of flaw
- If at all possible, use library calls rather than external processes to recreate the desired functionality.
- If possible, ensure that all external commands called from the program are statically created.
- Run time: Run time policy enforcement may be used in an allowlist fashion to prevent use of any non-sanctioned commands.
More Improper Neutralization of Special Elements used in a Command vulnerabilities (CWE-77)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- incibe.es/incibe-cert/alerta-temprana/vulnerabilidades/cve-2025-26331Third Party Advisory
Other vulnerabilities in Wyse Proprietary OS (Modern ThinOS)
- 7.8 High severity
- 8.4 High severity
- 7.0 High severity
- 7.1 High severity
- 7.6 High severity
Recent Improper Neutralization of Special Elements used in a Command vulnerabilities
- 7.2 High severity
- 9.8 Critical severity
- 9.8 Critical severity
- 7.1 High severity
- 9.8 Critical severity
- 8.8 High severity
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