CVE-2026-92895: File Upload RCE (CVSS 8.1)

Description

The Live2DWebCanvas plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.2.1 via the download_one_file function. This is due to missing file extension whitelist and MIME type validation in download_one_file() when writing files derived from attacker-controlled manifest entries to the web-served plugin directory. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible when the plugin's apiType setting is configured as custom-local (self-hosted model mode), a non-default option that requires a paid license and prints the REST nonce and one-time session tokens into every front-end page.

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CVSS v3.1 Score

8.1

HIGH

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

EPSS — Exploit Prediction

0.0092

Probability of exploitation

0.61%

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/live-2d/trunk/src/live2d-V2Api.php#L1016 https://plugins.trac.wordpress.org/browser/live-2d/trunk/src/live2d-V2Api.php#L1054 https://plugins.trac.wordpress.org/browser/live-2d/trunk/src/live2d-V2Api.php#L114 https://plugins.trac.wordpress.org/browser/live-2d/trunk/src/live2d-V2Api.php#L235 https://plugins.trac.wordpress.org/browser/live-2d/trunk/src/live2d-V2Api.php#L965 https://plugins.trac.wordpress.org/browser/live-2d/trunk/wordpress-live2d.php#L190 https://www.wordfence.com/threat-intel/vulnerabilities/id/d6f6a941-972d-420f-bc56-e4b955e30313?source=cve

Frequently Asked Questions

What is CVE-2026-92895? +

The Live2DWebCanvas plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.2.1 via the download_one_file function. This is due to missing file extension whitelist and MIME type validation in download_one_file() when writing files derived from attacker-controlled manifest entries to the web-served plugin directory. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible when the plugin's apiType setting is configured as custom-local (self-hosted model mode), a non-default option that requires a paid license and prints the REST nonce and one-time session tokens into every front-end page. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-92895? +

CVE-2026-92895 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0092, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-92895? +

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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