# CVE-2020-15179: HTML Injection in ScratchSig

> Attackers with edit permissions can inject scripts via the ScratchSig extension, leading to code execution and potential account takeover on MediaWiki sites.

- **Severity:** High 8.0 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 15 Sep 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-gp9v-pg9f-vmp6

## What is CVE-2020-15179?

CVE-2020-15179 is a high-severity cross-site scripting vulnerability in InternationalScratchWiki wiki-scratchsig, published on 15 Sep 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

The ScratchSig extension for MediaWiki before version 1.0.1 allows stored Cross-Site Scripting. Using <script> tag inside <scratchsig> tag, attackers with edit permission can execute scripts on visitors' browser. With MediaWiki JavaScript API, this can potentially lead to privilege escalation and/or account takeover. This has been patched in release 1.0.1. This has already been deployed to all Scratch Wikis. No workarounds exist other than disabling the extension completely.

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

## Which versions are affected by CVE-2020-15179?

It affects 1 product.


Products: Scratch-Wiki Scratchsig.

## How do I fix CVE-2020-15179?

No fix has been published for CVE-2020-15179 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-15179 being exploited?

There is no known exploitation of CVE-2020-15179 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-15179 and fix it if it is affected.

What it is: CVE-2020-15179 is a high-severity cross-site scripting vulnerability in InternationalScratchWiki wiki-scratchsig, published on 15 Sep 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-15179 in the wild and no public exploit code.

Affected product: InternationalScratchWiki wiki-scratchsig. 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-2020-15179/ (Markdown: https://insights.sbomify.com/CVE-2020-15179/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-15179
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-15179
- OSV: https://osv.dev/vulnerability/CVE-2020-15179

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-15179/
Summaries are generated and may contain mistakes; the official description above is the record.