# CVE-2026-26213: thingino-firmware api.cgi Unauthenticated Command Injection in Captive Portal

> Remote attackers can execute arbitrary commands as root via unsanitized HTTP parameters in the captive portal, leading to full device compromise.

- **Severity:** High 8.7 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Mar 2026
- **Updated:** 14 Jul 2026
- **Also known as:** GHSA-h56g-w4h5-4239

## What is CVE-2026-26213?

CVE-2026-26213 is a high-severity command injection vulnerability in themactep thingino-firmware, published on 26 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

thingino-firmware versions up to the firmware-2026-03-16 release contains an unauthenticated os command injection vulnerability in the WiFi captive portal CGI script that allows remote attackers to execute arbitrary commands as root by injecting malicious code through unsanitized HTTP parameter names. Attackers can exploit the eval function in parse_query() and parse_post() functions to achieve remote code execution and perform privileged configuration changes including root password reset and SSH authorized_keys modification, resulting in full persistent device compromise.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2026-26213?

It affects 1 product.


Products: Thingino Thingino Firmware.

## How do I fix CVE-2026-26213?

No fix has been published for CVE-2026-26213 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-26213 being exploited?

There is no known exploitation of CVE-2026-26213 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-26213 and fix it if it is affected.

What it is: CVE-2026-26213 is a high-severity command injection vulnerability in themactep thingino-firmware, published on 26 Mar 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-2026-26213 in the wild and no public exploit code.

Affected product: themactep thingino-firmware. 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-2026-26213/ (Markdown: https://insights.sbomify.com/CVE-2026-26213/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-26213
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-26213
- OSV: https://osv.dev/vulnerability/CVE-2026-26213

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-26213/
Summaries are generated and may contain mistakes; the official description above is the record.