# CVE-2025-9533: TOTOLINK T10 formLoginAuth.htm improper authentication

> Remote attackers can bypass authentication on TOTOLINK T10 routers by manipulating the authCode parameter in formLoginAuth.htm.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/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:** 27 Aug 2025
- **Updated:** 27 Aug 2025
- **Also known as:** GHSA-43m2-5vcp-3fpm

## What is CVE-2025-9533?

CVE-2025-9533 is a medium-severity authentication bypass vulnerability in TOTOLINK T10, published on 27 Aug 2025. 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 T10 4.1.8cu.5241_B20210927. Affected is an unknown function of the file /formLoginAuth.htm. The manipulation of the argument authCode with the input 1 leads to improper authentication. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2025-9533?

It affects 1 product.


Products: Totolink T10 Firmware.

## How do I fix CVE-2025-9533?

No fix has been published for CVE-2025-9533 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-9533 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-9533 exists.

## Other vulnerabilities in TOTOLINK T10

- [CVE-2022-25130](https://insights.sbomify.com/CVE-2022-25130/): Command injection in n/a (critical 9.8)
- [CVE-2022-25131](https://insights.sbomify.com/CVE-2022-25131/): Command injection in n/a (critical 9.8)
- [CVE-2022-25132](https://insights.sbomify.com/CVE-2022-25132/): Command injection in n/a (critical 9.8)
- [CVE-2022-25136](https://insights.sbomify.com/CVE-2022-25136/): Command injection in n/a (critical 9.8)
- [CVE-2022-25137](https://insights.sbomify.com/CVE-2022-25137/): Command injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-9533 and fix it if it is affected.

What it is: CVE-2025-9533 is a medium-severity authentication bypass vulnerability in TOTOLINK T10, published on 27 Aug 2025. 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-2025-9533 exists.

Affected product: TOTOLINK T10. 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-2025-9533/ (Markdown: https://insights.sbomify.com/CVE-2025-9533/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-9533
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-9533
- OSV: https://osv.dev/vulnerability/CVE-2025-9533

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-9533/
Summaries are generated and may contain mistakes; the official description above is the record.