# CVE-2018-18841: Cross-site scripting in n/a

> Cross-site scripting vulnerability in SEMCMS PHP allows attackers to inject malicious scripts via the tag_indexkey parameter.

- **Severity:** Medium 4.8 (`CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 30 Oct 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-grv6-9pv4-8gf4

## What is CVE-2018-18841?

CVE-2018-18841 is a medium-severity cross-site scripting vulnerability in Sem-Cms Semcms, published on 30 Oct 2018. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

XSS was discovered in SEMCMS PHP V3.4 via the SEMCMS_SeoAndTag.php?Class=edit&CF=SeoAndTag tag_indexkey parameter.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2018-18841?

It affects 1 product.


Products: Sem-Cms Semcms.

## How do I fix CVE-2018-18841?

No fix has been published for CVE-2018-18841 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-18841 being exploited?

There is no known exploitation of CVE-2018-18841 in the wild and no public exploit code.

## Other vulnerabilities in Sem-Cms Semcms

- [CVE-2025-25686](https://insights.sbomify.com/CVE-2025-25686/): SQL injection in n/a (critical 9.8)
- [CVE-2024-46103](https://insights.sbomify.com/CVE-2024-46103/): SQL injection in n/a (critical 9.8)
- [CVE-2024-30938](https://insights.sbomify.com/CVE-2024-30938/): SQL injection in n/a (critical 9.8)
- [CVE-2024-31012](https://insights.sbomify.com/CVE-2024-31012/): File upload in n/a (critical 9.8)
- [CVE-2024-25422](https://insights.sbomify.com/CVE-2024-25422/): SQL injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-18841 and fix it if it is affected.

What it is: CVE-2018-18841 is a medium-severity cross-site scripting vulnerability in Sem-Cms Semcms, published on 30 Oct 2018. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2018-18841 in the wild and no public exploit code.

Affected product: Sem-Cms Semcms. 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-2018-18841/ (Markdown: https://insights.sbomify.com/CVE-2018-18841/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-18841
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-18841
- OSV: https://osv.dev/vulnerability/CVE-2018-18841

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-18841/
Summaries are generated and may contain mistakes; the official description above is the record.