# CVE-2026-12938: Tribulant Newsletters Lite Stored XSS in newsletters_post shortcode

Source: https://junglewise.ai/threats/cve-2026-12938-tribulant-newsletters-lite-stored-xss-in-newsletters-post  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-29. Updated: 2026-07-29  
License: CC BY 4.0 with a link back

CVE-2026-12938 · Severity: medium · CVSS 6.4 · Published 2026-07-29

The Newsletters Lite plugin for WordPress, which is used to manage email marketing and newsletters, contains a security flaw that allows users with basic contributor permissions to inject malicious scripts into website pages. When other users or administrators visit these affected pages, the scripts can execute automatically, potentially leading to unauthorized actions or data theft. This vulnerability impacts all versions of the plugin up to and including 4.15.

Vendors: [Tribulant](https://junglewise.ai/threats/vendors/tribulant).

## Quick answers

**Is CVE-2026-12938 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-12938 being exploited in the wild.

**How severe is CVE-2026-12938?** Medium severity, with a CVSS score of 6.4, published 29 July 2026.

**Which products and versions are affected?** Tribulant Newsletters Lite up to and including 4.15.

**Is there a fix for CVE-2026-12938?** 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-2026-12938 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-12938?** Check whether you run Tribulant Newsletters Lite 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 Newsletters Lite plugin for WordPress is vulnerable to Stored Cross-Site Scripting (XSS) due to insufficient input sanitization and output escaping in the posts_single() function. Specifically, an attacker-controlled 'target' attribute in the [newsletters_post] shortcode is propagated into the global $wpml_target variable. This variable is subsequently concatenated into a target="..." HTML attribute within the shortcode_posts() 'post_thumbnail' handler without being passed through esc_attr(). Authenticated attackers with Contributor-level access or higher can exploit this to inject arbitrary web scripts that execute in the context of a user's browser when they view the affected page. A patch appears to have been addressed in a recent changeset.

## Affected products

- Tribulant Newsletters Lite up to and including 4.15

## Timeline

- 2026-07-29: advisory: NVD publication date

## References

- [https://plugins.trac.wordpress.org/browser/newsletters-lite/tags/4.15/helpers/shortcode.php](https://plugins.trac.wordpress.org/browser/newsletters-lite/tags/4.15/helpers/shortcode.php)
- [https://plugins.trac.wordpress.org/browser/newsletters-lite/tags/4.15/helpers/shortcode.php](https://plugins.trac.wordpress.org/browser/newsletters-lite/tags/4.15/helpers/shortcode.php)
- [https://plugins.trac.wordpress.org/browser/newsletters-lite/tags/4.15/helpers/shortcode.php](https://plugins.trac.wordpress.org/browser/newsletters-lite/tags/4.15/helpers/shortcode.php)
- [https://plugins.trac.wordpress.org/browser/newsletters-lite/tags/4.15/helpers/shortcode.php](https://plugins.trac.wordpress.org/browser/newsletters-lite/tags/4.15/helpers/shortcode.php)
- [https://plugins.trac.wordpress.org/browser/newsletters-lite/tags/4.15/includes/checkinit.php](https://plugins.trac.wordpress.org/browser/newsletters-lite/tags/4.15/includes/checkinit.php)
- [https://plugins.trac.wordpress.org/changeset?reponame=&old=3621582%40newsletters-lite&new=3621582%40newsletters-lite](https://plugins.trac.wordpress.org/changeset?reponame=&old=3621582%40newsletters-lite&new=3621582%40newsletters-lite)
- [https://www.wordfence.com/threat-intel/vulnerabilities/id/293abae5-a7fb-401f-af09-324a81ce8709?source=cve](https://www.wordfence.com/threat-intel/vulnerabilities/id/293abae5-a7fb-401f-af09-324a81ce8709?source=cve)

## Related threats

- [Tribulant Newsletters Lite Stored XSS in post_thumbnail shortcode](https://junglewise.ai/threats/cve-2026-12939-tribulant-newsletters-lite-stored-xss-in-post-thumbnail-shortcode)