# CVE-2026-82555: TOTOLINK N600R Authentication cstecgi.cgi loginAuth random values

> Attackers can bypass authentication on TOTOLINK N600R routers due to insufficiently random values in the login process.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Aug 2026
- **Updated:** 31 Aug 2026
- **Also known as:** GHSA-ph8r-m79f-q97v

## What is CVE-2026-82555?

CVE-2026-82555 is a medium-severity vulnerability in TOTOLINK N600R, published on 30 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been found in TOTOLINK N600R 4.3.0cu.7866_B20220506. This vulnerability affects the function loginAuth of the file /web_cste/cgi-bin/cstecgi.cgi of the component Authentication Handler. Such manipulation leads to insufficiently random values. It is possible to launch the attack remotely. This attack is characterized by high complexity. It is stated that the exploitability is difficult. The exploit has been disclosed to the public and may be used.

Weakness: CWE-330 (Use of Insufficiently Random Values), CWE-310

## Which versions are affected by CVE-2026-82555?


## How do I fix CVE-2026-82555?

No fix has been published for CVE-2026-82555 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-82555 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-82555 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-82555 and fix it if it is affected.

What it is: CVE-2026-82555 is a medium-severity vulnerability in TOTOLINK N600R, published on 30 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-82555 exists.

Affected product: TOTOLINK N600R. 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-2026-82555/ (Markdown: https://insights.sbomify.com/CVE-2026-82555/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-82555
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-82555
- OSV: https://osv.dev/vulnerability/CVE-2026-82555

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-82555/
Summaries are generated and may contain mistakes; the official description above is the record.