# CVE-2026-14833: Lightbox with PhotoSwipe < 5.9.0 - Author+ Stored XSS via data-lbwps-caption Attribute

> Authors can inject malicious JavaScript via image captions, leading to code execution when visitors or admins view the lightbox.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 31 Jul 2026
- **Updated:** 31 Jul 2026
- **Also known as:** GHSA-r6rj-q66h-w8m7

## What is CVE-2026-14833?

CVE-2026-14833 is a medium-severity cross-site scripting vulnerability in Unknown Lightbox with PhotoSwipe, published on 31 Jul 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

The Lightbox with PhotoSwipe WordPress plugin before 5.9.0 does not sanitise or escape a link data attribute before rendering it into the image lightbox caption in the browser, allowing users with author-level access and above (who lack the unfiltered_html capability) to store JavaScript that runs when a visitor or administrator opens the lightbox.

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

## Which versions are affected by CVE-2026-14833?


## How do I fix CVE-2026-14833?

No fix has been published for CVE-2026-14833 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-14833 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-14833 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-14833 and fix it if it is affected.

What it is: CVE-2026-14833 is a medium-severity cross-site scripting vulnerability in Unknown Lightbox with PhotoSwipe, published on 31 Jul 2026. An attacker needs administrator access to exploit it, 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-2026-14833 exists.

Affected product: Unknown Lightbox with PhotoSwipe. 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-2026-14833/ (Markdown: https://insights.sbomify.com/CVE-2026-14833/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-14833
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-14833
- OSV: https://osv.dev/vulnerability/CVE-2026-14833

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-14833/
Summaries are generated and may contain mistakes; the official description above is the record.