# CVE-2026-74253: Regular Labs Sourcerer RCE in unverified reflected input

Source: https://junglewise.ai/threats/cve-2026-74253-regular-labs-sourcerer-rce-in-unverified-reflected-input  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-17. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-74253 · Severity: info · Published 2026-08-17

Regular Labs Sourcerer is a popular Joomla extension that allows administrators to embed custom code into Joomla pages. A vulnerability in versions before 16.0.0 allows unauthenticated attackers to execute arbitrary code by injecting malicious input that is reflected in the final HTML without proper validation. An attacker could gain complete control over the affected Joomla website and access sensitive data or deface content.

Technologies: [Regular Labs Sourcerer](https://junglewise.ai/threats/technologies/sourcerer). Vendors: [Regular Labs](https://junglewise.ai/threats/vendors/regular-labs).

## Quick answers

**Is CVE-2026-74253 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-74253 being exploited in the wild.

**How severe is CVE-2026-74253?** Informational severity, published 17 August 2026.

**Which products and versions are affected?** Regular Labs Sourcerer before 16.0.0.

**Is there a fix for CVE-2026-74253?** A patch was published on 2026: Fixed in version 16.0.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-74253 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-74253?** Check whether you run Regular Labs Sourcerer 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 vulnerability is a reflected code injection issue in Sourcerer's handling of {source} blocks. The extension processes these blocks in Joomla's final rendered HTML without reliably verifying the source or origin of the injected code, allowing an unauthenticated attacker to craft and reflect malicious input through the application. The attack requires no authentication and is reachable via the network. A successful exploit allows remote code execution (RCE) with the privileges of the Joomla application. The vulnerability is fixed in version 16.0.0 and later.

## Affected products

- Regular Labs Sourcerer before 16.0.0

## Timeline

- 2026-08-17: disclosed
- 2026: patched: Fixed in version 16.0.0

## References

- [https://regularlabs.com/](https://regularlabs.com/)

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- [Regular Labs Sourcerer for Joomla improper access control in PHP execution](https://junglewise.ai/threats/cve-2026-64796-regular-labs-sourcerer-for-joomla-improper-access-control-in-php)
- [Regular Labs Joomla extensions sensitive information disclosure in Smart Search](https://junglewise.ai/threats/cve-2026-64792-regular-labs-joomla-extensions-sensitive-information-disclosure)