# CVE-2026-90491: sanjevirau gsubs Electron index.js showQuerySuccessPage code injection

> Remote attackers can execute arbitrary code via the showQuerySuccessPage function in the gsubs Electron application due to improper handling of the filename argument.

- **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:** 15 Sep 2026
- **Also known as:** GHSA-qcwq-wqp5-v342

## What is CVE-2026-90491?

CVE-2026-90491 is a medium-severity code injection vulnerability in sanjevirau gsubs, 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 weakness has been identified in sanjevirau gsubs up to 1.0.3. Impacted is the function showQuerySuccessPage of the file renderer/index.js of the component Electron. Executing a manipulation of the argument filename can lead to code injection. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2026-90491?


## How do I fix CVE-2026-90491?

No fix has been published for CVE-2026-90491 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-90491 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-90491 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-90491 and fix it if it is affected.

What it is: CVE-2026-90491 is a medium-severity code injection vulnerability in sanjevirau gsubs, 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-90491 exists.

Affected product: sanjevirau gsubs. 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-2026-90491/ (Markdown: https://insights.sbomify.com/CVE-2026-90491/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-90491
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-90491
- OSV: https://osv.dev/vulnerability/CVE-2026-90491

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-90491/
Summaries are generated and may contain mistakes; the official description above is the record.