# CVE-2026-45011: Apostrophe has stored XSS via javascript: URL in Image Widget Link

> An editor can inject malicious JavaScript via image widget links, allowing arbitrary code execution in victims' browsers upon interaction.

- **Severity:** High 7.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/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:** No
- **Published:** 12 Jun 2026
- **Updated:** 15 Jun 2026
- **Also known as:** GHSA-5f64-7vfc-rcx6

## What is CVE-2026-45011?

CVE-2026-45011 is a high-severity cross-site scripting vulnerability in apostrophecms apostrophe, published on 12 Jun 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

ApostropheCMS is an open-source Node.js content management system. Version 4.29.0 has a stored cross-site scripting vulnerability in the image widget functionality. A user with the Editor role can configure an image widget link to use a javascript: URL payload. Because editors have permission to publish pages, the malicious widget can be published to the live site. When another user, including an administrator or public visitor, clicks the affected image/link, arbitrary JavaScript executes in the victim’s browser. As of time of publication, no known patched versions are available.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation), CWE-116 (Improper Encoding or Escaping of Output)

## Which versions are affected by CVE-2026-45011?

2 open source packages ship an affected version, including apostrophe.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `apostrophe` | npm | All versions | None |
| `apostrophe` | npm | All versions | None |

## How do I fix CVE-2026-45011?

No fix has been published for CVE-2026-45011 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-45011 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45011 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-45011 and fix it if it is affected.

What it is: CVE-2026-45011 is a high-severity cross-site scripting vulnerability in apostrophecms apostrophe, published on 12 Jun 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-2026-45011 exists.

Affected packages and fixed versions:
- apostrophe (npm): affected all versions; no fix listed
- apostrophe (npm): affected all versions; no fix listed

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-2026-45011/ (Markdown: https://insights.sbomify.com/CVE-2026-45011/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-45011
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-45011
- OSV: https://osv.dev/vulnerability/CVE-2026-45011

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-45011/
Summaries are generated and may contain mistakes; the official description above is the record.