# CVE-2026-2402: Auth bypass in PowerChute™ Serial Shutdown

> Attackers can bypass authentication limits to take over user accounts via excessive login attempts on PowerChute Serial Shutdown.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Apr 2026
- **Updated:** 14 Apr 2026
- **Also known as:** GHSA-gwjq-j584-rm32

## What is CVE-2026-2402?

CVE-2026-2402 is a medium-severity authentication bypass vulnerability in Schneider Electric PowerChute™ Serial Shutdown, published on 14 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

CWE-307 Improper Restriction of Excessive Authentication Attempts vulnerability exists that would allow an attacker to gain access to the user account by performing an arbitrary number of authentication attempts with different credentials on a sequence of requests to multiple endpoints.

Weakness: CWE-307 (Improper Restriction of Excessive Authentication Attempts)

## Which versions are affected by CVE-2026-2402?

It affects 1 product.


Products: Schneider-Electric Powerchute Serial Shutdown.

## How do I fix CVE-2026-2402?

No fix has been published for CVE-2026-2402 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-2402 being exploited?

There is no known exploitation of CVE-2026-2402 in the wild and no public exploit code.

## Other vulnerabilities in Schneider Electric PowerChute™ Serial Shutdown

- [CVE-2026-2399](https://insights.sbomify.com/CVE-2026-2399/): Path traversal in PowerChute™ Serial Shutdown (medium 6.9)
- [CVE-2026-2404](https://insights.sbomify.com/CVE-2026-2404/): Other in PowerChute™ Serial Shutdown (medium 6.9)
- [CVE-2026-2400](https://insights.sbomify.com/CVE-2026-2400/): Other in PowerChute™ Serial Shutdown (medium 5.3)
- [CVE-2026-2403](https://insights.sbomify.com/CVE-2026-2403/): Other in PowerChute™ Serial Shutdown (medium 5.3)
- [CVE-2026-2405](https://insights.sbomify.com/CVE-2026-2405/): Denial of service in PowerChute™ Serial Shutdown (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-2402 and fix it if it is affected.

What it is: CVE-2026-2402 is a medium-severity authentication bypass vulnerability in Schneider Electric PowerChute™ Serial Shutdown, published on 14 Apr 2026. 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-2026-2402 in the wild and no public exploit code.

Affected product: Schneider Electric PowerChute™ Serial Shutdown. 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-2026-2402/ (Markdown: https://insights.sbomify.com/CVE-2026-2402/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-2402
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-2402
- OSV: https://osv.dev/vulnerability/CVE-2026-2402

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-2402/
Summaries are generated and may contain mistakes; the official description above is the record.