# CVE-2026-111713: tarteaucitron.js before 1.37.0 XSS via getElemAttr Attribute Validation Mismatch

> Attackers with markup insertion privileges can execute arbitrary JavaScript in the site's origin via a mismatch in attribute validation for iframe sources.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA: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:** No
- **Published:** 16 Oct 2026
- **Updated:** 20 Oct 2026
- **Also known as:** GHSA-rfp9-xrhw-w637

## What is CVE-2026-111713?

CVE-2026-111713 is a medium-severity cross-site scripting vulnerability in AmauriC tarteaucitron.js, published on 16 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

tarteaucitron.js before 1.37.0 contains a cross-site scripting vulnerability because getElemAttr resolves 'data-' prefixed attributes while the https-only guard validates the unprefixed attribute. Attackers who can place markup, such as CMS authors, can add data-url with a javascript: URL beside a benign url to execute script in the site's origin via iframe src.

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

## Which versions are affected by CVE-2026-111713?


## How do I fix CVE-2026-111713?

No fix has been published for CVE-2026-111713 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-111713 being exploited?

There is no known exploitation of CVE-2026-111713 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-111713 and fix it if it is affected.

What it is: CVE-2026-111713 is a medium-severity cross-site scripting vulnerability in AmauriC tarteaucitron.js, published on 16 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: There is no known exploitation of CVE-2026-111713 in the wild and no public exploit code.

Affected product: AmauriC tarteaucitron.js. 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-2026-111713/ (Markdown: https://insights.sbomify.com/CVE-2026-111713/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-111713
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-111713
- OSV: https://osv.dev/vulnerability/CVE-2026-111713

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-111713/
Summaries are generated and may contain mistakes; the official description above is the record.