# CVE-2026-5347: Missing authorization in WP Books Gallery – Build Stunning Book Showcases & Libraries in Minutes

> Unauthenticated attackers can modify the custom post type slug for the books gallery, breaking existing links and SEO rankings.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 Apr 2026
- **Updated:** 24 Apr 2026
- **Also known as:** GHSA-7cw2-vvg5-h9pj

## What is CVE-2026-5347?

CVE-2026-5347 is a medium-severity missing authorization vulnerability in mhmrajib WP Books Gallery – Build Stunning Book Showcases & Libraries in Minutes, published on 24 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The HM Books Gallery plugin for WordPress is vulnerable to Missing Authorization in versions up to and including 4.8.0. This is due to the absence of capability checks and nonce verification in the admin_init hook that handles the permalink settings update at line 205-209 of wp-books-gallery.php. The vulnerable code checks only for the presence of the 'permalink_structure' POST parameter before updating the 'wbg_cpt_slug' option, without verifying that the request comes from an authenticated administrator. This makes it possible for unauthenticated attackers to modify the custom post type slug for the books gallery, which changes the URL structure for all book entries and can break existing links and SEO rankings.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-5347?


## How do I fix CVE-2026-5347?

No fix has been published for CVE-2026-5347 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-5347 being exploited?

There is no known exploitation of CVE-2026-5347 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-5347 and fix it if it is affected.

What it is: CVE-2026-5347 is a medium-severity missing authorization vulnerability in mhmrajib WP Books Gallery – Build Stunning Book Showcases & Libraries in Minutes, published on 24 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-5347 in the wild and no public exploit code.

Affected product: mhmrajib WP Books Gallery – Build Stunning Book Showcases & Libraries in Minutes. 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-2026-5347/ (Markdown: https://insights.sbomify.com/CVE-2026-5347/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-5347
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5347
- OSV: https://osv.dev/vulnerability/CVE-2026-5347

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-5347/
Summaries are generated and may contain mistakes; the official description above is the record.