# CVE-2026-90492: webgjc web_robot web.py controller_recover os command injection

> Remote attackers can execute arbitrary OS commands via the case_name argument in the controller_recover function of web_robot.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 13 Sep 2026
- **Updated:** 14 Sep 2026
- **Also known as:** GHSA-ff59-mhrh-hcvf

## What is CVE-2026-90492?

CVE-2026-90492 is a medium-severity command injection vulnerability in webgjc web_robot, published on 13 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A security vulnerability has been detected in webgjc web_robot 2.4.0/2.5.0/2.8.0. The affected element is the function controller_listen/controller_recover of the file py/web.py. The manipulation of the argument case_name leads to os command injection. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command), CWE-77 (Improper Neutralization of Special Elements used in a Command)

## Which versions are affected by CVE-2026-90492?


## How do I fix CVE-2026-90492?

No fix has been published for CVE-2026-90492 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-90492 being exploited?

There is no known exploitation of CVE-2026-90492 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-90492 and fix it if it is affected.

What it is: CVE-2026-90492 is a medium-severity command injection vulnerability in webgjc web_robot, published on 13 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-90492 in the wild and no public exploit code.

Affected product: webgjc web_robot. 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-2026-90492/ (Markdown: https://insights.sbomify.com/CVE-2026-90492/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-90492
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-90492
- OSV: https://osv.dev/vulnerability/CVE-2026-90492

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-90492/
Summaries are generated and may contain mistakes; the official description above is the record.