# CVE-2020-26868: ARC Informatique PcVue Access to Critical Private Variable via Public Method

> An unauthorized user can modify validation information, leading to denial of service and data modification in PcVue SCADA systems.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Oct 2020
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-hmv8-293h-5vrj

## What is CVE-2020-26868?

CVE-2020-26868 is a high-severity missing authorization vulnerability in ARC Informatique PcVue, published on 12 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

ARC Informatique PcVue prior to version 12.0.17 is vulnerable to a denial-of-service attack due to the ability of an unauthorized user to modify information used to validate messages sent by legitimate web clients. This issue also affects third-party systems based on the Web Services Toolkit.

Weakness: CWE-668 (Exposure of Resource to Wrong Sphere), CWE-767 (Access to Critical Private Variable via Public Method)

## Which versions are affected by CVE-2020-26868?

It affects 1 product.


Products: Arcinfo Pcvue.

## How do I fix CVE-2020-26868?

No fix has been published for CVE-2020-26868 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-26868 being exploited?

There is no known exploitation of CVE-2020-26868 in the wild and no public exploit code.

## Other vulnerabilities in ARC Informatique PcVue

- [CVE-2020-26867](https://insights.sbomify.com/CVE-2020-26867/): ARC Informatique PcVue Deserialization of Untrusted Data (critical 9.8)
- [CVE-2026-14868](https://insights.sbomify.com/CVE-2026-14868/): Weak encryption mechanism for User directory (high 8.4)
- [CVE-2020-26869](https://insights.sbomify.com/CVE-2020-26869/): ARC Informatique PcVue Exposure of Sensitive Information to an Unauthorized Actor (high 7.5)
- [CVE-2026-14867](https://insights.sbomify.com/CVE-2026-14867/): Insecure password storage in User directory (medium 6.8)
- [CVE-2022-4312](https://insights.sbomify.com/CVE-2022-4312/): Information disclosure in PcVue (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-26868 and fix it if it is affected.

What it is: CVE-2020-26868 is a high-severity missing authorization vulnerability in ARC Informatique PcVue, published on 12 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-26868 in the wild and no public exploit code.

Affected product: ARC Informatique PcVue. 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-2020-26868/ (Markdown: https://insights.sbomify.com/CVE-2020-26868/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-26868
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-26868
- OSV: https://osv.dev/vulnerability/CVE-2020-26868

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-26868/
Summaries are generated and may contain mistakes; the official description above is the record.