# CVE-2026-67596: CSL 1010 M2M 3G WiFi Module 2.2.1.4 Weak Encryption via Router.cfg

> Attackers can decrypt configuration backups using a weak XOR cipher to expose sensitive credentials and SIM identifiers on CSL 3G WiFi modules.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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:** 30 Jul 2026
- **Updated:** 31 Jul 2026
- **Also known as:** GHSA-fvx5-jmmg-89rf

## What is CVE-2026-67596?

CVE-2026-67596 is a medium-severity vulnerability in CSL 1010 M2M 3G WiFi Module, published on 30 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

CSL 1010 M2M 3G WiFi Module firmware through 2.2.1.4 contains a weak encryption vulnerability that allows unauthenticated attackers to recover all stored secrets in plaintext by reversing a single-byte XOR cipher that uses a static key to obfuscate the configuration backup file. Attackers can trivially decrypt the Router.cfg backup file to expose web administration and telnet passwords, WPA/WPA2 pre-shared keys, PPPoE and 3G/APN credentials, and SIM identifiers including IMSI and IMEI.

Weakness: CWE-261 (Weak Encoding for Password)

## Which versions are affected by CVE-2026-67596?


## How do I fix CVE-2026-67596?

No fix has been published for CVE-2026-67596 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-67596 being exploited?

There is no known exploitation of CVE-2026-67596 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-67596 and fix it if it is affected.

What it is: CVE-2026-67596 is a medium-severity vulnerability in CSL 1010 M2M 3G WiFi Module, published on 30 Jul 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-2026-67596 in the wild and no public exploit code.

Affected product: CSL 1010 M2M 3G WiFi Module. 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-2026-67596/ (Markdown: https://insights.sbomify.com/CVE-2026-67596/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-67596
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-67596
- OSV: https://osv.dev/vulnerability/CVE-2026-67596

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-67596/
Summaries are generated and may contain mistakes; the official description above is the record.