# CVE-2026-48822: Shaarli has Stored Cross-Site Scripting (XSS) via Markdown Reference Links

> An authenticated user can inject malicious JavaScript via Markdown reference links in bookmark descriptions, leading to stored XSS.

- **Severity:** Medium 5.8 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 17 Jun 2026
- **Updated:** 18 Jun 2026
- **Also known as:** DEBIAN-CVE-2026-48822, GHSA-2hgr-63wv-x462, UBUNTU-CVE-2026-48822

## What is CVE-2026-48822?

CVE-2026-48822 is a medium-severity cross-site scripting vulnerability in Shaarli, published on 17 Jun 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

Shaarli is a personal bookmarking service. Versions 0.16.1 and prior contain a stored Cross-Site Scripting (XSS) vulnerability in the Markdown-to-HTML conversion process used in the Bookmark Description field. An authenticated user can inject a malicious javascript: URI inside a Markdown link. The vulnerability originates in the filterProtocols method within BookmarkMarkdownFormatter.php.This method attempts to sanitize Markdown links by filtering dangerous protocols (such as javascript:) before rendering. It uses the following regular expression: (#]\((.*?)\)#is). This regex is designed to detect inline Markdown links, but it fails to detect Markdown reference-style links because reference-style links are resolved by the Markdown parser after preprocessing. The filterProtocols method never inspects the actual URL used in these references and as a result, an attacker can supply a javascript: URI inside a reference definition. This issue has been fixed in version 0.16.2.

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

## Which versions are affected by CVE-2026-48822?


## How do I fix CVE-2026-48822?

No fix has been published for CVE-2026-48822 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-48822 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48822 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-48822 and fix it if it is affected.

What it is: CVE-2026-48822 is a medium-severity cross-site scripting vulnerability in Shaarli, published on 17 Jun 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48822 exists.

Affected product: Shaarli. 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-2026-48822/ (Markdown: https://insights.sbomify.com/CVE-2026-48822/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-48822
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-48822
- OSV: https://osv.dev/vulnerability/CVE-2026-48822

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-48822/
Summaries are generated and may contain mistakes; the official description above is the record.