bagisto has Cross Site Scripting (XSS) issue in TinyMCE Image Upload (HTML)
Summary
In Bagisto v2.3.7, the TinyMCE image upload functionality allows an attacker with sufficient privileges (e.g. admin) to upload a crafted HTML file containing embedded JavaScript. When viewed, the malicious code executes in the context of the admin/user’s browser.
Details
The application blocks the uploading of HTML files; however, if the backend detected that the content of the .png file is HTML or JavaScript, the file extension will be automatically converted from .png to .html. When the HTML is viewed, it will execute the JavaScript code.
PoC
Created a html file, renamed the extension to .png, and uploaded the file. It was converted to HTML file in the backend. When opened in another tab, the JavaScript code will execute. <img width="1605" height="702" alt="image" src="https://github.com/user-attachments/assets/bd9406aa-2380-464f-ac21-32d483639969" /> <img width="1358" height="314" alt="image" src="https://github.com/user-attachments/assets/e5a64a5a-39fb-4fdb-ada9-14c4b9554803" />
Impact
A aalicious script is stored in HTML file and executed when the content is viewed. An attacker (with upload privilege) can target other admin users or editors who view the content, enabling session hijacking, unauthorized actions, or privilege escalation.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | bagisto/bagisto | < 2.3.8 | 2.3.8 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N- Weakness (CWE)
CWE-79, CWE-80, CWE-87- Platform
- Composer
- Package
bagisto/bagisto- Disclosed
- 16.10.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-67px-r26w-598x - CC BY 4.0
Vulnerability history: bagisto/bagisto
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 20
- First → latest
- 11.2019 04.2026
- Without a fix
- 2
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 8
- Medium 9
- Low 2
Disclosures per year
- 2019: 1
- 2020: 0
- 2021: 0
- 2022: 1
- 2023: 0
- 2024: 4
- 2025: 6
- 2026: 8
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bagisto has Cross Site Scripting (XSS) issue in TinyMCE Image Upload (HTML) this entry
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