# CVE-2026-28778: Hardcoded FTP Credentials and LPE(via Insecure Permissions) for `xd` Local Account on IDC SFX2100

> Remote attackers can use hardcoded FTP credentials to log in and overwrite root-executed binaries, achieving arbitrary code execution as root.

- **Severity:** High 7.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Mar 2026
- **Updated:** 5 Mar 2026
- **Also known as:** GHSA-56j6-vx52-7wx9

## What is CVE-2026-28778?

CVE-2026-28778 is a high-severity vulnerability in International Datacasting Corporation (IDC) IDC SFX2100 SuperFlex Satellite Receiver, published on 4 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

International Datacasting Corporation (IDC) SFX Series SuperFlex Satellite Receiver contains undocumented, hardcoded/insecure credentials for the `xd` user account. A remote unauthenticated attacker can log in via FTP using these credentials. Because the `xd` user has write permissions to their home directory where root-executed binaries and symlinks (such as those invoked by `xdstartstop`) are stored, the attacker can overwrite these files or manipulate symlinks to achieve arbitrary code execution as the root user.

Weakness: CWE-798 (Use of Hard-coded Credentials)

## Which versions are affected by CVE-2026-28778?

It affects 1 product.


Products: Datacast Sfx2100 Firmware.

## How do I fix CVE-2026-28778?

No fix has been published for CVE-2026-28778 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-28778 being exploited?

There is no known exploitation of CVE-2026-28778 in the wild and no public exploit code.

## Other vulnerabilities in International Datacasting Corporation (IDC) IDC SFX2100 SuperFlex Satellite Receiver

- [CVE-2026-28775](https://insights.sbomify.com/CVE-2026-28775/): Unauthenticated RCE via SNMP Default Writable Community String (critical 10.0)
- [CVE-2026-28773](https://insights.sbomify.com/CVE-2026-28773/): Authenticated OS Command Injection via Ping Utility Leading to RCE as Root (critical 9.3)
- [CVE-2026-28774](https://insights.sbomify.com/CVE-2026-28774/): Authenticated OS Command Injection via Traceroute Utility leads to Root RCE (critical 9.3)
- [CVE-2026-29127](https://insights.sbomify.com/CVE-2026-29127/): Incorrect Permission Assignment(777) on `monitor` Users Home Directory Containing SUID Root Binaries in IDC SFX2100 (critical 9.2)
- [CVE-2026-28777](https://insights.sbomify.com/CVE-2026-28777/): Hardcoded and Insecure Credentials for "User" Local Account with SSH Access On IDC SFX2100 Satellite Receiver (critical 9.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-28778 and fix it if it is affected.

What it is: CVE-2026-28778 is a high-severity vulnerability in International Datacasting Corporation (IDC) IDC SFX2100 SuperFlex Satellite Receiver, published on 4 Mar 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-2026-28778 in the wild and no public exploit code.

Affected product: International Datacasting Corporation (IDC) IDC SFX2100 SuperFlex Satellite Receiver. 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-2026-28778/ (Markdown: https://insights.sbomify.com/CVE-2026-28778/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-28778
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-28778
- OSV: https://osv.dev/vulnerability/CVE-2026-28778

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-28778/
Summaries are generated and may contain mistakes; the official description above is the record.