# CVE-2026-20781: CloudCharge cloudcharge.se Missing Authentication for Critical Function

> Unauthenticated attackers can impersonate charging stations via WebSocket endpoints to manipulate data and control infrastructure.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/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:** Not needed
- **Fix available:** No
- **Published:** 26 Feb 2026
- **Updated:** 5 Mar 2026
- **Also known as:** GHSA-926q-p427-pgcj

## What is CVE-2026-20781?

CVE-2026-20781 is a critical missing authorization vulnerability in cloudcharge.se, published on 26 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

WebSocket endpoints lack proper authentication mechanisms, enabling 
attackers to perform unauthorized station impersonation and manipulate 
data sent to the backend. An unauthenticated attacker can connect to the
 OCPP WebSocket endpoint using a known or discovered charging station 
identifier, then issue or receive OCPP commands as a legitimate charger.
 Given that no authentication is required, this can lead to privilege 
escalation, unauthorized control of charging infrastructure, and 
corruption of charging network data reported to the backend.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-20781?

It affects 1 product.


Products: Cloudcharge Cloudcharge.se.

## How do I fix CVE-2026-20781?

No fix has been published for CVE-2026-20781 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-20781 being exploited?

There is no known exploitation of CVE-2026-20781 in the wild and no public exploit code.

## Other vulnerabilities in cloudcharge.se

- [CVE-2026-25114](https://insights.sbomify.com/CVE-2026-25114/): CloudCharge cloudcharge.se Improper Restriction of Excessive Authentication Attempts (high 8.7)
- [CVE-2026-20733](https://insights.sbomify.com/CVE-2026-20733/): CloudCharge cloudcharge.se Insufficiently Protected Credentials (medium 6.9)
- [CVE-2026-27652](https://insights.sbomify.com/CVE-2026-27652/): CloudCharge cloudcharge.se Insufficient Session Expiration (medium 6.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-20781 and fix it if it is affected.

What it is: CVE-2026-20781 is a critical missing authorization vulnerability in cloudcharge.se, published on 26 Feb 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-2026-20781 in the wild and no public exploit code.

Affected product: cloudcharge.se. 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-2026-20781/ (Markdown: https://insights.sbomify.com/CVE-2026-20781/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-20781
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20781
- OSV: https://osv.dev/vulnerability/CVE-2026-20781

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-20781/
Summaries are generated and may contain mistakes; the official description above is the record.