CVE-2026-76012: File Upload RCE (CVSS 7.5)

Description

The Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 4.4.1 via the legacy_render function. This is due to broken authorization on the Lightroom gallery_edit endpoint combined with mass assignment of gallery path and unrestricted file upload into a registered template directory, whose extension check uses a substring match that accepts sanitized .php_ filenames as valid templates. This makes it possible for authenticated attackers, with custom-level access and above, to execute code on the server. Exploitation requires the authenticated attacker to be the stored author of at least one existing NextGEN gallery, as ownership of that gallery is the sole authorization check gating the mass-assignment and upload steps.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0083

Probability of exploitation

0.58%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-434 Unrestricted Upload

References

Other References

https://plugins.trac.wordpress.org/browser/nextgen-gallery/tags/4.3.0/src/DisplayType/Controller.php#L564 https://plugins.trac.wordpress.org/browser/nextgen-gallery/tags/4.3.0/src/DisplayType/LegacyTemplateLocator.php#L142 https://plugins.trac.wordpress.org/browser/nextgen-gallery/tags/4.3.0/src/Lightroom/Controller.php#L1355 https://plugins.trac.wordpress.org/browser/nextgen-gallery/tags/4.3.0/src/Lightroom/Controller.php#L1465 https://plugins.trac.wordpress.org/browser/nextgen-gallery/tags/4.3.0/src/Lightroom/Controller.php#L197 https://plugins.trac.wordpress.org/browser/nextgen-gallery/tags/4.3.0/src/Lightroom/Controller.php#L45 https://plugins.trac.wordpress.org/changeset/3699076/nextgen-gallery/trunk/src/DisplayType/Controller.php https://www.wordfence.com/threat-intel/vulnerabilities/id/f8b09972-4d2d-4ab3-bc12-7aba32aefd49?source=cve

Frequently Asked Questions

What is CVE-2026-76012? +

The Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 4.4.1 via the legacy_render function. This is due to broken authorization on the Lightroom gallery_edit endpoint combined with mass assignment of gallery path and unrestricted file upload into a registered template directory, whose extension check uses a substring match that accepts sanitized .php_ filenames as valid templates. This makes it possible for authenticated attackers, with custom-level access and above, to execute code on the server. Exploitation requires the authenticated attacker to be the stored author of at least one existing NextGEN gallery, as ownership of that gallery is the sole authorization check gating the mass-assignment and upload steps. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-76012? +

CVE-2026-76012 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0083, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-76012? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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