# CVE-2026-20893: Privilege escalation in Fujitsu Security Solution AuthConductor Client Basic V2

> An attacker with local access can execute arbitrary code with SYSTEM privileges or modify registry values due to an origin validation error.

- **Severity:** High 8.5 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 7 Jan 2026
- **Updated:** 7 Jan 2026
- **Also known as:** GHSA-h2fp-m732-cq75

## What is CVE-2026-20893?

CVE-2026-20893 is a high-severity vulnerability in Fujitsu Security Solution AuthConductor Client Basic V2, published on 7 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Origin validation error issue exists in Fujitsu Security Solution AuthConductor Client Basic V2 2.0.25.0 and earlier. If this vulnerability is exploited, an attacker who can log in to the Windows system where the affected product is installed may execute arbitrary code with SYSTEM privilege and/or modify the registry value.

Weakness: CWE-346 (Origin Validation Error)

## Which versions are affected by CVE-2026-20893?


## How do I fix CVE-2026-20893?

No fix has been published for CVE-2026-20893 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-20893 being exploited?

There is no known exploitation of CVE-2026-20893 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-20893 and fix it if it is affected.

What it is: CVE-2026-20893 is a high-severity vulnerability in Fujitsu Security Solution AuthConductor Client Basic V2, published on 7 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-20893 in the wild and no public exploit code.

Affected product: Fujitsu Security Solution AuthConductor Client Basic V2. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-20893/ (Markdown: https://insights.sbomify.com/CVE-2026-20893/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-20893
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20893
- OSV: https://osv.dev/vulnerability/CVE-2026-20893

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-20893/
Summaries are generated and may contain mistakes; the official description above is the record.