# CVE-2026-15098: Cross-site scripting in Real3D Flipbook – 3D FlipBook, PDF FlipBook, PDF Viewer, PDF Embedder

> Authenticated contributors can inject arbitrary scripts via shortcode attributes, potentially compromising editors or administrators who view the content.

- **Severity:** Medium 6.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A: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:** 19 Sep 2026
- **Updated:** 19 Sep 2026
- **Also known as:** GHSA-4vrv-fq2h-vgq6

## What is CVE-2026-15098?

CVE-2026-15098 is a medium-severity cross-site scripting vulnerability in creativeinteractivemedia Real3D Flipbook – 3D FlipBook, PDF FlipBook, PDF Viewer, PDF Embedder, published on 19 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The Real3D Flipbook Lite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'lightboxtext' shortcode attribute (and other unsanitized attributes handled by on_shortcode()) in versions up to, and including, 5.1.1. This is due to insufficient input sanitization and output escaping in the on_shortcode() and print_global_options() functions: shortcode attribute values are copied verbatim into $this->flipbook_options and then emitted via wp_json_encode() inside a <script type="application/json"> block without the JSON_HEX_TAG flag, allowing a literal </script> byte sequence in the attribute value to break out of the JSON script context. Because WordPress's shortcode_parse_atts() applies stripcslashes() to attribute values, an attacker can encode the breakout tag as \x3c/script\x3e\x3cscript\x3e…\x3c/script\x3e, which survives the wp_kses_post save-time filter applied to Contributor content (the escape bytes are safe text characters, not HTML tags) and is decoded to real angle brackets at render time. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user (typically an Editor or Administrator previewing/moderating the pending post) accesses an injected page.

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

## Which versions are affected by CVE-2026-15098?


## How do I fix CVE-2026-15098?

No fix has been published for CVE-2026-15098 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-15098 being exploited?

There is no known exploitation of CVE-2026-15098 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-15098 and fix it if it is affected.

What it is: CVE-2026-15098 is a medium-severity cross-site scripting vulnerability in creativeinteractivemedia Real3D Flipbook – 3D FlipBook, PDF FlipBook, PDF Viewer, PDF Embedder, published on 19 Sep 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-2026-15098 in the wild and no public exploit code.

Affected product: creativeinteractivemedia Real3D Flipbook – 3D FlipBook, PDF FlipBook, PDF Viewer, PDF Embedder. 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-2026-15098/ (Markdown: https://insights.sbomify.com/CVE-2026-15098/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-15098
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-15098
- OSV: https://osv.dev/vulnerability/CVE-2026-15098

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-15098/
Summaries are generated and may contain mistakes; the official description above is the record.