# CVE-2026-111442: Cross-site scripting in Backdrop

> Attackers can execute scripts via crafted SVG uploads if viewed directly, requiring an upgrade to Backdrop CMS.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/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:** Not needed
- **Fix available:** No
- **Published:** 16 Oct 2026
- **Updated:** 21 Oct 2026
- **Also known as:** GHSA-gcjx-3jpq-qx2p

## What is CVE-2026-111442?

CVE-2026-111442 is a medium-severity cross-site scripting vulnerability in BackdropCMS Backdrop, published on 16 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Backdrop CMS Core 1.35.x before 1.35.2 and 1.34.x before 1.34.6 does not sufficiently validate uploaded SVG images to ensure they lack potentially dangerous SVG tags. SVG images can contain clickable links or executable scripting. By uploading a crafted SVG, it is possible to execute scripting in the browser when an SVG image is viewed. This issue is mitigated by the attacker needing to be able to upload SVG images, and that Backdrop embeds all uploaded SVG images within <img> tags, which prevents script from executing. The SVG must be viewed directly by its URL in order to run any embedded scripting.

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

## Which versions are affected by CVE-2026-111442?


## How do I fix CVE-2026-111442?

No fix has been published for CVE-2026-111442 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-111442 being exploited?

There is no known exploitation of CVE-2026-111442 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-111442 and fix it if it is affected.

What it is: CVE-2026-111442 is a medium-severity cross-site scripting vulnerability in BackdropCMS Backdrop, published on 16 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-111442 in the wild and no public exploit code.

Affected product: BackdropCMS Backdrop. 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-2026-111442/ (Markdown: https://insights.sbomify.com/CVE-2026-111442/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-111442
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-111442
- OSV: https://osv.dev/vulnerability/CVE-2026-111442

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-111442/
Summaries are generated and may contain mistakes; the official description above is the record.