# CVE-2026-117543: Joomla jDownloads SSRF via external download URL

Source: https://junglewise.ai/threats/cve-2026-117543-joomla-extension-jdownloads-com-ssrf-via-external-download-url  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-12. Updated: 2026-11-12  
License: CC BY 4.0 with a link back

CVE-2026-117543 · Severity: info · Published 2026-11-12

jDownloads is a file download manager extension for Joomla CMS. An SSRF vulnerability in versions before 4.1.8 allows attackers to bypass URL validation when retrieving external downloads by exploiting HTTP redirects, enabling server-side requests to internal resources and disclosure of their responses. This could lead to exposure of sensitive internal data or internal service compromise.

Technologies: [jDownloads](https://junglewise.ai/threats/technologies/jdownloads). Vendors: [jDownloads](https://junglewise.ai/threats/vendors/jdownloads).

## Quick answers

**Is CVE-2026-117543 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-117543 being exploited in the wild.

**How severe is CVE-2026-117543?** Informational severity, published 12 November 2026.

**Which products and versions are affected?** jDownloads < 4.1.8.

**Is there a fix for CVE-2026-117543?** Yes: fixed in 4.1.8. Until then: External downloads that require HTTP redirects during server-side retrieval will be rejected; use direct file URLs instead of redirected URLs where possible. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-117543 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-117543?** Check whether you run jDownloads 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.

## How to fix

- Fixed in 4.1.8

External downloads that require HTTP redirects during server-side retrieval will be rejected; use direct file URLs instead of redirected URLs where possible.

## Technical details

The vulnerability is a server-side request forgery (SSRF) in the external download URL processing logic of jDownloads. Validation of download destination URLs fails to account for HTTP redirects during server-side retrieval, allowing an attacker to craft an external URL that redirects to an internal or prohibited destination. This permits unauthorized server-side requests and response disclosure. The fix in version 4.1.8 adds stricter validation and may reject external downloads requiring HTTP redirects.

## Affected products

- jDownloads jDownloads < 4.1.8

## Timeline

- 2026-11-12: disclosed
- 2026-11-12: patched: Version 4.1.8 released as security update

## References

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

## Related threats

- [jDownloads IDOR in other_file_id parameter allows unauthorized file access](https://junglewise.ai/threats/cve-2026-117544-joomla-extension-jdownloads-com-idor-allowing-restricted-file)
- [jDownloads authenticated path traversal via update_file parameter](https://junglewise.ai/threats/cve-2026-117542-joomla-extension-jdownloads-com-authenticated-path-traversal-in)
- [Joomla jDownloads file upload RCE in thumbnail handling](https://junglewise.ai/threats/cve-2026-117551-joomla-extension-jdownloads-com-rce-through-file-upload-in)
- [Joomla jDownloads file publication bypass with manipulated submission parameters](https://junglewise.ai/threats/cve-2026-117550-joomla-extension-jdownloads-com-publishing-of-files-without)
- [jDownloads Joomla extension unauthenticated file upload in upload-handler.php](https://junglewise.ai/threats/cve-2026-61900-jdownloads-joomla-extension-unauthenticated-file-upload-in-upload)