# CVE-2026-4048: Command injection in ECS Connections Manager

> Authenticated attackers with high privileges can execute arbitrary OS commands via unsanitized input in custom WAF rule files on Progress ADC products.

- **Severity:** High 8.4 (`CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Apr 2026
- **Updated:** 22 Apr 2026
- **Also known as:** GHSA-pwx9-99jm-fx95

## What is CVE-2026-4048?

CVE-2026-4048 is a high-severity command injection vulnerability in Progress Software ECS Connections Manager, published on 20 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

OS Command Injection Remote Code Execution Vulnerability in UI in Progress ADC Products allows an authenticated attacker with “All” permissions to execute arbitrary commands on the LoadMaster appliance by exploiting unsanitized input in a custom WAF rule file during the file upload process.

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

## Which versions are affected by CVE-2026-4048?

It affects 3 products.


Products: Progress Connection Manager for Objectscale, Progress Ecs Connection Manager, Progress Loadmaster.

## How do I fix CVE-2026-4048?

No fix has been published for CVE-2026-4048 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4048 being exploited?

There is no known exploitation of CVE-2026-4048 in the wild and no public exploit code.

## Other vulnerabilities in Progress Software ECS Connections Manager

- [CVE-2026-8037](https://insights.sbomify.com/CVE-2026-8037/): Progress LoadMaster Command Injection (critical 9.6, exploited in the wild)
- [CVE-2026-59686](https://insights.sbomify.com/CVE-2026-59686/): Command injection in ECS Connection Manager (high 8.4)
- [CVE-2026-59687](https://insights.sbomify.com/CVE-2026-59687/): Command injection in ECS Connection Manager (high 8.4)
- [CVE-2026-59688](https://insights.sbomify.com/CVE-2026-59688/): Command injection in ECS Connection Manager (high 8.4)
- [CVE-2026-3517](https://insights.sbomify.com/CVE-2026-3517/): Command injection in ECS Connections Manager (high 8.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4048 and fix it if it is affected.

What it is: CVE-2026-4048 is a high-severity command injection vulnerability in Progress Software ECS Connections Manager, published on 20 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-4048 in the wild and no public exploit code.

Affected product: Progress Software ECS Connections Manager. 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-2026-4048/ (Markdown: https://insights.sbomify.com/CVE-2026-4048/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4048
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4048
- OSV: https://osv.dev/vulnerability/CVE-2026-4048

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4048/
Summaries are generated and may contain mistakes; the official description above is the record.