# CVE-2026-29521: Hereta ETH-IMC408M CSRF via Configuration Setup

> Attackers can modify device configuration, including network settings and RADIUS accounts, by tricking users into visiting malicious pages.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 16 Mar 2026
- **Updated:** 17 Mar 2026
- **Also known as:** GHSA-3cmm-8xw2-c67r

## What is CVE-2026-29521?

CVE-2026-29521 is a medium-severity vulnerability in Shenzhen Hereta Technology Co., Ltd. Hereta ETH-IMC408M, published on 16 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Hereta ETH-IMC408M firmware version 1.0.15 and prior contain a cross-site request forgery vulnerability that allows attackers to modify device configuration by exploiting missing CSRF protections in setup.cgi. Attackers can host malicious pages that submit forged requests using automatically-included HTTP Basic Authentication credentials to add RADIUS accounts, alter network settings, or trigger diagnostics.

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2026-29521?

It affects 1 product.


Products: Hereta Eth-Imc408m Firmware.

## How do I fix CVE-2026-29521?

No fix has been published for CVE-2026-29521 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-29521 being exploited?

There is no known exploitation of CVE-2026-29521 in the wild and no public exploit code.

## Other vulnerabilities in Shenzhen Hereta Technology Co., Ltd. Hereta ETH-IMC408M

- [CVE-2026-29510](https://insights.sbomify.com/CVE-2026-29510/): Hereta ETH-IMC408M Stored XSS via Device Name (medium 5.1)
- [CVE-2026-29513](https://insights.sbomify.com/CVE-2026-29513/): Hereta ETH-IMC408M Stored XSS via Device Location (medium 5.1)
- [CVE-2026-29520](https://insights.sbomify.com/CVE-2026-29520/): Hereta ETH-IMC408M Reflected XSS via ping_ipaddr Parameter (medium 5.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-29521 and fix it if it is affected.

What it is: CVE-2026-29521 is a medium-severity vulnerability in Shenzhen Hereta Technology Co., Ltd. Hereta ETH-IMC408M, published on 16 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-29521 in the wild and no public exploit code.

Affected product: Shenzhen Hereta Technology Co., Ltd. Hereta ETH-IMC408M. 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-2026-29521/ (Markdown: https://insights.sbomify.com/CVE-2026-29521/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-29521
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-29521
- OSV: https://osv.dev/vulnerability/CVE-2026-29521

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-29521/
Summaries are generated and may contain mistakes; the official description above is the record.