# CVE-2026-80180: Apache Allura: Stored XSS via markdown HTML processing

> Attackers can inject malicious scripts via markdown processing in Apache Allura, potentially stealing user sessions or executing code.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 4 Sep 2026
- **Updated:** 4 Sep 2026
- **Also known as:** GHSA-w8gw-2cgm-wv2h

## What is CVE-2026-80180?

CVE-2026-80180 is a medium-severity cross-site scripting vulnerability in Apache Allura, published on 4 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Stored XSS via markdown HTML processing in Apache Allura.

This issue affects Apache Allura: from through 1.20.0.

Users are recommended to upgrade to version 1.21.0, which fixes the issue.

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

## Which versions are affected by CVE-2026-80180?


## How do I fix CVE-2026-80180?

No fix has been published for CVE-2026-80180 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-80180 being exploited?

There is no known exploitation of CVE-2026-80180 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-80180 and fix it if it is affected.

What it is: CVE-2026-80180 is a medium-severity cross-site scripting vulnerability in Apache Allura, published on 4 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-80180 in the wild and no public exploit code.

Affected product: Apache Allura. 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-2026-80180/ (Markdown: https://insights.sbomify.com/CVE-2026-80180/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-80180
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-80180
- OSV: https://osv.dev/vulnerability/CVE-2026-80180

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-80180/
Summaries are generated and may contain mistakes; the official description above is the record.