# CVE-2026-1548: Totolink A7000R cstecgi.cgi CloudACMunualUpdateUserdata command injection

> Remote attackers can execute arbitrary commands on Totolink A7000R routers via the CloudACMunualUpdateUserdata function in cstecgi.cgi.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Jan 2026
- **Updated:** 23 Feb 2026
- **Also known as:** GHSA-f752-h5rp-h694

## What is CVE-2026-1548?

CVE-2026-1548 is a medium-severity command injection vulnerability in Totolink A7000R, published on 28 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A flaw has been found in Totolink A7000R 4.1cu.4154. This impacts the function CloudACMunualUpdateUserdata of the file /cgi-bin/cstecgi.cgi. This manipulation of the argument url causes command injection. The attack can be initiated remotely. The exploit has been published and may be used.

Weakness: CWE-77 (Improper Neutralization of Special Elements used in a Command), CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2026-1548?

It affects 1 product.


Products: Totolink A7000r Firmware.

## How do I fix CVE-2026-1548?

No fix has been published for CVE-2026-1548 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-1548 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1548 exists.

## Other vulnerabilities in Totolink A7000R

- [CVE-2025-51452](https://insights.sbomify.com/CVE-2025-51452/): Auth bypass in n/a (critical 9.8)
- [CVE-2024-28639](https://insights.sbomify.com/CVE-2024-28639/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-49417](https://insights.sbomify.com/CVE-2023-49417/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-49418](https://insights.sbomify.com/CVE-2023-49418/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-32993](https://insights.sbomify.com/CVE-2022-32993/): Missing authorization in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-1548 and fix it if it is affected.

What it is: CVE-2026-1548 is a medium-severity command injection vulnerability in Totolink A7000R, published on 28 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1548 exists.

Affected product: Totolink A7000R. 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-2026-1548/ (Markdown: https://insights.sbomify.com/CVE-2026-1548/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-1548
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1548
- OSV: https://osv.dev/vulnerability/CVE-2026-1548

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-1548/
Summaries are generated and may contain mistakes; the official description above is the record.