PowerStore 500T: External Control of File Name or Path
CVE-2026-86355 is a high-severity external control of file name or path vulnerability in PowerStore 500T from Dell, with a CVSS 3.1 base score of 8.3 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. The record lists version 5.1.0.0-2798105 or later as the first without the flaw, so updating PowerStore 500T to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.51% 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 PowerStore 500T to 5.1.0.0-2798105 or later or a later version.
- Update PowerStore 1000T to 5.1.0.0-2798105 or later or a later version.
- Update PowerStore 1200T to 5.1.0.0-2798105 or later or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Dell | PowerStore 500T | before 5.1.0.0-2798105 or later | 5.1.0.0-2798105 or later |
| Dell | PowerStore 1000T | before 5.1.0.0-2798105 or later | 5.1.0.0-2798105 or later |
| Dell | PowerStore 1200T | before 5.1.0.0-2798105 or later | 5.1.0.0-2798105 or later |
| Dell | PowerStore 3000T | before 5.1.0.0-2798105 or later | 5.1.0.0-2798105 or later |
| Dell | PowerStore 3200Q | before 5.1.0.0-2798105 or later | 5.1.0.0-2798105 or later |
| Dell | PowerStore 3200T | before 5.1.0.0-2798105 or later | 5.1.0.0-2798105 or later |
| Dell | PowerStore 5000T | before 5.1.0.0-2798105 or late | 5.1.0.0-2798105 or late |
| Dell | PowerStore 5200Q | before 5.1.0.0-2798105 or later | 5.1.0.0-2798105 or later |
| Dell | PowerStore 5200T | before 5.1.0.0-2798105 or later | 5.1.0.0-2798105 or later |
| Dell | PowerStore 7000T | before 5.1.0.0-2798105 or later | 5.1.0.0-2798105 or later |
| Dell | PowerStore 9000T | before 5.1.0.0-2798105 or later | 5.1.0.0-2798105 or later |
| Dell | PowerStore 9200T | before 5.1.0.0-2798105 or late | 5.1.0.0-2798105 or late |
| Dell | PowerStore 1500 | before 5.1.0.0-2798105 or later | 5.1.0.0-2798105 or later |
| Dell | PowerStore 5500 | before 5.1.0.0-2798105 or later | 5.1.0.0-2798105 or later |
| Dell | PowerStore 9500 | before 5.1.0.0-2798105 or later | 5.1.0.0-2798105 or later |
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
- NetworkCan be exploited remotely over a network, including the internet.
- 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
- LowPerformance or availability is reduced.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L. Scored by CNA (emc.com).
Official description
Dell PowerStore contains an External Control of File Name or Path vulnerability. A remote authenticated attacker could exploit this vulnerability, potentially leading to privilege escalation on the appliance.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: External Control of File Name or Path
The product allows user input to control or influence paths or file names that are used in filesystem operations.
How developers prevent this class of flaw
- When the set of filenames is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames, and reject all other inputs. For example, ID 1 could map to inbox.txt and ID 2 could map to profile.txt. Features such as the ESAPI AccessReferenceMap provide this capability.
- Run your code in a jail or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict all access to files within a particular directory. Examples include the Unix chroot jail and AppArmor. In general, managed code may provide some protection. This may not be a feasible solution, and it only limits the impact to the operating system; the rest of your application may still be subject to compromise. Be careful to avoid CWE-243 and other weaknesses related to jails.
- For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
More External Control of File Name or Path vulnerabilities (CWE-73)
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
Other references
Other vulnerabilities in PowerStore 500T
- 8.8 High severity
- 9.1 Critical severity
- 8.1 High severity
- 8.8 High severity
- 8.7 High severity
- 7.2 High severity
Recent External Control of File Name or Path vulnerabilities
- 9.1 Critical severity
- 7.5 High severity
- 7.1 High severity
- 10.0 Critical severity
- 8.1 High severity
- 7.5 High severity
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