classroombookings up to 2.17.0 User Display Name layout.php read displayname cross site scripting

Summaryinfo

A vulnerability was found in classroombookings up to 2.17.0. It has been classified as problematic. Affected is the function read of the file crbs-core/application/views/layout.php of the component User Display Name Handler. This manipulation of the argument displayname causes cross site scripting. This vulnerability is tracked as CVE-2026-6486. The attack is possible to be carried out remotely. Moreover, an exploit is present. Upgrading the affected component is recommended. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Detailsinfo

A vulnerability was found in classroombookings up to 2.17.0. It has been declared as problematic. Affected by this vulnerability is the function read of the file crbs-core/application/views/layout.php of the component User Display Name Handler. The manipulation of the argument displayname with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-6486. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details and also a public exploit are known. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

It is possible to download the exploit at github.com. It is declared as proof-of-concept. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product. By approaching the search of inurl:crbs-core/application/views/layout.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 2.17.1 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 69c3c9bb8a17f1ea572d8f4502bf238f0214c98a is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• classroombookings

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17.0

License

• open-source

Website

• Product: https://github.com/classroombookings/classroombookings/

CPE 2.3info

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Entryinfo

Submitinfo

Accepted

• Submit #786154: Craig A Rodway classroombookings 2.16.4 Stored Cross-Site Scripting (XSS) (by sudosme)

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