# CVE-2026-108260: @tinacms/web-components: `tina-markdown` writes rich-text link URLs into `href` without scheme validation, allowing stored XSS

> Attackers can inject malicious scripts via stored links in TinaCMS, leading to code execution and potential credential theft for site visitors.

- **Severity:** High 7.6 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N`)
- **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:** Yes
- **Published:** 9 Oct 2026
- **Updated:** 13 Oct 2026
- **Also known as:** GHSA-c42q-qvc3-j6vg

## What is CVE-2026-108260?

CVE-2026-108260 is a high-severity cross-site scripting vulnerability in @tinacms tinacms, published on 9 Oct 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Tina is a headless content management system. Prior to 0.2.1, the tina-markdown element in packages/@tinacms/web-components/src/tina-markdown.js assigns a rich-text node.url value directly to an anchor href without validating the URL scheme. A content author can store a link using a script-capable scheme, and a visitor who clicks the rendered link executes attacker-controlled script in the site's origin. The script can access same-origin application data and, when the visitor is an editor or administrator, may expose credentials stored by the TinaCMS admin on that origin. This issue is fixed in version 0.2.1.

Weakness: CWE-83 (Improper Neutralization of Script in Attributes in a Web Page), CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-108260?

2 open source packages ship an affected version, including @tinacms/web-components.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `@tinacms/web-components` | npm | All versions | 0.2.1 |
| `@tinacms/web-components` | npm | All versions | 0.2.1 |

## How do I fix CVE-2026-108260?

Upgrade @tinacms/web-components to 0.2.1 or later.

## Is CVE-2026-108260 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-108260 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-108260 and fix it if it is affected.

What it is: CVE-2026-108260 is a high-severity cross-site scripting vulnerability in @tinacms tinacms, published on 9 Oct 2026. Any signed-in user can exploit it over the 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-2026-108260 exists.

Affected packages and fixed versions:
- @tinacms/web-components (npm): affected all versions; fixed in 0.2.1
- @tinacms/web-components (npm): affected all versions; fixed in 0.2.1

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-2026-108260/ (Markdown: https://insights.sbomify.com/CVE-2026-108260/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-108260
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-108260
- OSV: https://osv.dev/vulnerability/CVE-2026-108260

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-108260/
Summaries are generated and may contain mistakes; the official description above is the record.