# CVE-2026-88857: OrdaSoft Joomla Gallery arbitrary file upload and code execution

Source: https://junglewise.ai/threats/cve-2026-88857-joomla-extension-ordasoft-com-authenticated-privileged-remote  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-20. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-88857 · Severity: info · Published 2026-09-20

OrdaSoft Joomla Gallery is a media management extension for Joomla websites. The extension's watermark feature fails to validate uploaded file types, allowing authenticated administrators to upload and execute PHP code by masquerading files with fake image headers. An attacker with admin privileges can gain complete control over the Joomla website and its server.

Technologies: [OrdaSoft Joomla Gallery](https://junglewise.ai/threats/technologies/joomla-gallery). Vendors: [OrdaSoft](https://junglewise.ai/threats/vendors/ordasoft).

## Quick answers

**Is CVE-2026-88857 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-88857 being exploited in the wild.

**How severe is CVE-2026-88857?** Informational severity, published 20 September 2026.

**Which products and versions are affected?** OrdaSoft Joomla Gallery < 6.2.7.

**Is there a fix for CVE-2026-88857?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-88857 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-88857?** Check whether you run OrdaSoft Joomla Gallery at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The saveWatermark() function in OrdaSoft Joomla Gallery accepts file uploads without extension validation, content-type checking, or filename sanitization, storing them in a web-accessible directory. An authenticated user with core.manage privileges can upload a PHP file with a spoofed image Content-Type header, then directly execute it via HTTP request. This is a post-authentication arbitrary file upload leading to remote code execution.

## Affected products

- OrdaSoft Joomla Gallery < 6.2.7

## Timeline

- 2026-09-20: disclosed

## References

- [https://www.ordasoft.com/](https://www.ordasoft.com/)

## Related threats

- [OrdaSoft Joomla Gallery authenticated remote code execution](https://junglewise.ai/threats/cve-2026-88856-joomla-extension-ordasoft-com-authenticated-privileged-remote)
- [OrdaSoft Joomla Gallery SQL injection](https://junglewise.ai/threats/cve-2026-88855-joomla-extension-ordasoft-com-authenticated-privileged-sql)
- [OrdaSoft Joomla Gallery SQL injection in search module](https://junglewise.ai/threats/cve-2026-88854-joomla-extension-ordasoft-com-unauthenticated-sql-injection-in)