# CVE-2026-4827: Insufficient Entropy vulnerability on Multiple Products

> Attackers can exploit insufficient entropy in session management to gain unauthorized access to Schneider Electric industrial control products.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/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:** A user has to click or open something
- **Fix available:** No
- **Published:** 12 May 2026
- **Updated:** 14 May 2026
- **Also known as:** GHSA-r6x4-qp59-vf35

## What is CVE-2026-4827?

CVE-2026-4827 is a high-severity vulnerability in Schneider Electric Easergy C5, published on 12 May 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

CWE‑331: Insufficient Entropy vulnerability exists that could lead to unauthorized access when an attacker on the network can exploit weaknesses in session‑management protections.

Weakness: CWE-331 (Insufficient Entropy)

## Which versions are affected by CVE-2026-4827?


## How do I fix CVE-2026-4827?

No fix has been published for CVE-2026-4827 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4827 being exploited?

There is no known exploitation of CVE-2026-4827 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4827 and fix it if it is affected.

What it is: CVE-2026-4827 is a high-severity vulnerability in Schneider Electric Easergy C5, published on 12 May 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-2026-4827 in the wild and no public exploit code.

Affected product: Schneider Electric Easergy C5. 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-2026-4827/ (Markdown: https://insights.sbomify.com/CVE-2026-4827/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4827
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4827
- OSV: https://osv.dev/vulnerability/CVE-2026-4827

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-4827/
Summaries are generated and may contain mistakes; the official description above is the record.