# CVE-2020-26867: ARC Informatique PcVue Deserialization of Untrusted Data

> Remote attackers can execute arbitrary code on the web and mobile back-end server via unsafe deserialization in PcVue.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 16 Sep 2024
- **Also known as:** GHSA-7x49-vpw9-2vmr

## What is CVE-2020-26867?

CVE-2020-26867 is a critical unsafe deserialization 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 due to the deserialization of untrusted data, which may allow an attacker to remotely execute arbitrary code on the web and mobile back-end server.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2020-26867?

It affects 1 product.


Products: Arcinfo Pcvue.

## How do I fix CVE-2020-26867?

No fix has been published for CVE-2020-26867 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-26867 being exploited?

There is no known exploitation of CVE-2020-26867 in the wild and no public exploit code.

## Other vulnerabilities in ARC Informatique PcVue

- [CVE-2026-14868](https://insights.sbomify.com/CVE-2026-14868/): Weak encryption mechanism for User directory (high 8.4)
- [CVE-2020-26868](https://insights.sbomify.com/CVE-2020-26868/): ARC Informatique PcVue Access to Critical Private Variable via Public Method (high 7.5)
- [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-2020-26867 and fix it if it is affected.

What it is: CVE-2020-26867 is a critical unsafe deserialization 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-2020-26867 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-2020-26867/ (Markdown: https://insights.sbomify.com/CVE-2020-26867/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-26867
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-26867
- OSV: https://osv.dev/vulnerability/CVE-2020-26867

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-26867/
Summaries are generated and may contain mistakes; the official description above is the record.