# CVE-2026-15539: SourceCodester Online Book Store System Book Image Upload Feature index.php books unrestricted upload

> Remote attackers can upload malicious files via the book image upload feature, potentially leading to code execution.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Jul 2026
- **Updated:** 13 Jul 2026
- **Also known as:** GHSA-596x-7q4m-3hjq

## What is CVE-2026-15539?

CVE-2026-15539 is a medium-severity vulnerability in SourceCodester Online Book Store System, published on 13 Jul 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A security vulnerability has been detected in SourceCodester Online Book Store System 1.0. Impacted is an unknown function of the file /admin/index.php?page=books of the component Book Image Upload Feature. Such manipulation leads to unrestricted upload. The attack may be performed from remote. The exploit has been disclosed publicly and may be used.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type), CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-15539?


## How do I fix CVE-2026-15539?

No fix has been published for CVE-2026-15539 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-15539 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-15539 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-15539 and fix it if it is affected.

What it is: CVE-2026-15539 is a medium-severity vulnerability in SourceCodester Online Book Store System, published on 13 Jul 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-15539 exists.

Affected product: SourceCodester Online Book Store System. 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-2026-15539/ (Markdown: https://insights.sbomify.com/CVE-2026-15539/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-15539
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-15539
- OSV: https://osv.dev/vulnerability/CVE-2026-15539

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-15539/
Summaries are generated and may contain mistakes; the official description above is the record.