Loading story…
A critical stored cross-site scripting flaw, tracked as CVE-2026-65048, was disclosed in the Ninja Forms WordPress plugin. The vulnerability affects versions 3.10.4 through 3.14.9 and stems from the plugin's Repeatable Fieldset feature, where submission indexes are accepted without numeric validation and later rendered into HTML without proper escaping. Because the vulnerable input can be submitted through a public form, the issue can be exploited by an unauthenticated attacker.
A successful attack stores malicious JavaScript in form submissions and triggers execution when an administrator reviews those submissions in the WordPress admin panel. The flaw carries a CVSS 3.1 score of 9.3 and could enable session-cookie theft, administrator account creation, malicious plugin installation, and unauthorized modification of site content. Site owners using Ninja Forms are advised to upgrade to 3.15.0 or later to remediate the issue.
See affected versions and whether adversaries are exploiting it.
3 events from the most recent confirmed update back to the earliest known activity.
A CVE entry disclosed CVE-2026-65048, a critical unauthenticated stored cross-site scripting flaw in Ninja Forms' Repeatable Fieldset feature. The issue can be triggered through crafted public form submissions and may lead to administrator compromise when submissions are viewed in the WordPress admin panel.
The WordPress plugin listing indicates Ninja Forms version 3.15.0 was published on 2026-04-24. The CVE reference states updating to 3.15.0 or later remediates the unauthenticated stored XSS vulnerability affecting versions 3.10.4 through 3.14.9.
A security advisory reported multiple Ninja Forms vulnerabilities, including the previously documented unauthenticated stored XSS issue and a network-wide data-deletion vulnerability.
Vulnerabilities, threat actors, malware, products, organizations, and breaches Mallory has linked to this story.
See whether adversaries are exploiting this yet, and where the affected versions run in your environment.
3 references tracked. Mallory keeps watching after this page renders.
gmcsirt.gm
Open sourcecvefeed.io
Open sourcewordpress.org
Open sourceMap indicators from this story to your assets and identify affected systems in minutes.
Every observed campaign, victim, and pivot linked to actors named in this story.
Malware, exploits, and IOCs connected to the activity described here.
YARA, Sigma, and Snort rules deployed to your SIEM as soon as they’re published.
Get matching new stories delivered to your team as they break — not the next morning.
Ask questions about this story and take action on the answers.
Other stories Mallory is tracking that overlap on entities, sources, or topic labels.
A critical vulnerability in the WordPress plugin **Ninja Forms – File Uploads** has exposed more than **50,000 sites** to unauthenticated arbitrary file upload, with security researchers and CSIRT.SK reporting active exploitation in the wild. Tracked as `CVE-2026-0740`, the flaw affects versions **3.3.26 and earlier** and stems from insufficient validation of uploaded file types, file extensions, and file paths in `NF_FU_AJAX_Controllers_Uploads::handle_upload`, allowing attackers to upload malicious files, including PHP scripts. Successful exploitation can lead to **remote code execution** and full site compromise, giving attackers a path to persistent access and broader server takeover. Defenders are urged to update immediately to **version 3.3.27 or later** and review affected WordPress installations for unauthorized uploads or filesystem changes, as public reporting indicates the vulnerable plugin was deployed on tens of thousands of websites at the time of disclosure.
Jul 24, 2026
Attackers are actively exploiting **CVE-2026-0740**, a critical unauthenticated arbitrary file upload flaw in the **Ninja Forms File Uploads** premium add-on for WordPress that can lead to **remote code execution** and full site compromise. The vulnerability affects versions through `3.3.26` and stems from improper validation of file types and extensions in destination filenames, combined with missing filename sanitization that allows path traversal and placement of malicious PHP files in the webroot or other sensitive directories. Wordfence said it blocked more than **3,600** exploitation attempts in a 24-hour period and warned that attackers could use the bug to deploy web shells and take over vulnerable sites. Researcher **Sélim Lanouar** discovered the issue through Wordfence’s bug bounty program, and the vendor released a full fix in version `3.3.27` after an earlier partial remediation. Organizations using the add-on, which is deployed across more than **90,000** customer environments, have been urged to upgrade immediately.
Jun 29, 2026
Attackers are actively exploiting `CVE-2026-14894`, a critical CVSS 9.8 unauthenticated arbitrary-file-upload vulnerability in the WordPress **Super Forms – Drag & Drop Form Builder** plugin through version `6.3.313`. Insufficient file-type validation and a weak nonce mechanism in unauthenticated AJAX handlers let attackers obtain a valid nonce, upload executable PHP files, and potentially gain remote code execution and full control of affected sites. Roughly 13,000 active installations may be exposed. Exploitation was observed beginning July 14 and surged between August 18 and 25, with Wordfence blocking more than 250,000 attempts. Attackers have deployed a PHP webshell named `Mushr00w_upl.php`. Administrators should immediately upgrade to Super Forms `6.3.314`, released July 8, and investigate web roots and upload directories for unexpected PHP files and suspicious requests to the plugin's vulnerable AJAX endpoint.
Sep 5, 2026