# CVE-2018-1000641: Deserialization in n/a

> Attackers can execute arbitrary code and disclose information via PHP object injection in YesWiki's i18n module.

- **Severity:** Critical 9.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Aug 2018
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-q5vv-hjfg-5v6r

## What is CVE-2018-1000641?

CVE-2018-1000641 is a critical unsafe deserialization vulnerability in n/a, published on 20 Aug 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

YesWiki version <= cercopitheque beta 1 contains a PHP Object Injection vulnerability in Unserialising user entered parameter in i18n.inc.php that can result in execution of code, disclosure of information.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2018-1000641?

It affects 1 product.


Products: Yeswiki Yeswiki.

## How do I fix CVE-2018-1000641?

No fix has been published for CVE-2018-1000641 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-1000641 being exploited?

There is no known exploitation of CVE-2018-1000641 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2025-46348](https://insights.sbomify.com/CVE-2025-46348/): YesWiki Vulnerable to Unauthenticated Site Backup Creation and Download (critical 10.0)
- [CVE-2024-51478](https://insights.sbomify.com/CVE-2024-51478/): Use of a Broken or Risky Cryptographic Algorithm in YesWiki (critical 9.9)
- [CVE-2025-31131](https://insights.sbomify.com/CVE-2025-31131/): Path Traversal allowing arbitrary read of files in Yeswiki (high 8.6)
- [CVE-2025-46349](https://insights.sbomify.com/CVE-2025-46349/): YesWiki Vulnerable to Unauthenticated Reflected Cross-site Scripting (high 7.6)
- [CVE-2025-24017](https://insights.sbomify.com/CVE-2025-24017/): YesWiki Vulnerable to Unauthenticated DOM Based XSS (high 7.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-1000641 and fix it if it is affected.

What it is: CVE-2018-1000641 is a critical unsafe deserialization vulnerability in n/a, published on 20 Aug 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-1000641 in the wild and no public exploit code.

Affected product: n/a. 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-2018-1000641/ (Markdown: https://insights.sbomify.com/CVE-2018-1000641/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-1000641
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-1000641
- OSV: https://osv.dev/vulnerability/CVE-2018-1000641

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-1000641/
Summaries are generated and may contain mistakes; the official description above is the record.