CVE-2025-30166: admin classic XSS — Fix

Description

Pimcore's Admin Classic Bundle provides a Backend UI for Pimcore. An HTML injection issue allows users with access to the email sending functionality to inject arbitrary HTML code into emails sent via the admin interface, potentially leading to session cookie theft and the alteration of page content. The vulnerability was discovered in the /admin/email/send-test-email endpoint using the POST method. The vulnerable parameter is content, which permits the injection of arbitrary HTML code during the email sending process. While JavaScript code injection is blocked through filtering, HTML code injection remains possible. This vulnerability is fixed in 1.7.6.

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CVSS v3.1 Score

4.8

MEDIUM

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

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
pimcore	admin_classic_bundle	< 1.7.6

References

Advisories & Patches

https://github.com/pimcore/admin-ui-classic-bundle/commit/76b690d4f8fcd9c9d41766bc5238c2513242e60e

Other References

https://github.com/pimcore/admin-ui-classic-bundle/security/advisories/GHSA-x82r-6j37-vrgg

Frequently Asked Questions

What is CVE-2025-30166? +

Pimcore's Admin Classic Bundle provides a Backend UI for Pimcore. An HTML injection issue allows users with access to the email sending functionality to inject arbitrary HTML code into emails sent via the admin interface, potentially leading to session cookie theft and the alteration of page content. The vulnerability was discovered in the /admin/email/send-test-email endpoint using the POST method. The vulnerable parameter is content, which permits the injection of arbitrary HTML code during the email sending process. While JavaScript code injection is blocked through filtering, HTML code injection remains possible. This vulnerability is fixed in 1.7.6. It has a CVSS v3.1 base score of 4.8 (MEDIUM).

How severe is CVE-2025-30166? +

CVE-2025-30166 has a CVSS v3.1 score of 4.8 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-30166? +

CVE-2025-30166 affects products from pimcore, specifically: admin_classic_bundle. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-30166? +

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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