MicroSCADA SYS600: Incorrect Implementation of Authentication Algorithm
CVE-2026-9853 is a high-severity incorrect implementation of authentication algorithm vulnerability in MicroSCADA SYS600 from Hitachi Energy, 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. Affected MicroSCADA SYS600 versions: 10.0 through 10.8. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.14% 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
- Check which version of MicroSCADA SYS600 you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on publisher.hitachienergy.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Hitachi Energy | MicroSCADA SYS600 | 10.0 through 10.8 | Not stated |
| Hitachienergy | Microscada X Sys600 | 10.0 through 10.8 | 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 NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.5 | High | CNA (hitachienergy.com) |
| CVSS 3.1 | 7.8 | High | NVD |
Official description
A vulnerability exists in SYS600 which allows any user authenticated to the operating system of the server hosting the application to read and modify application objects without being authenticated to the SYS600 system itself. Only the SYS600 system users should be permitted to view and modify application objects.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Incorrect Implementation of Authentication Algorithm
The requirements for the product dictate the use of an established authentication algorithm, but the implementation of the algorithm is incorrect.
More Incorrect Implementation of Authentication Algorithm vulnerabilities (CWE-303)
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 vulnerabilities in MicroSCADA SYS600
- 7.8 High severity
- 7.8 High severity
- 8.2 High severity
Recent Incorrect Implementation of Authentication Algorithm vulnerabilities
- 8.8 High severity
- 7.3 High severity
- 9.8 Critical severity
- 8.8 High severity
- 9.1 Critical severity
- 8.1 High severity
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