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GHSA-mvgm-3rw2-7j4r
No affected components available
Impact
When editing a page, XWiki warns since version 15.9 when there is content on the page like a script macro that would gain more rights due to the editing. This analysis doesn't consider certain kinds of properties, allowing a user to put malicious scripts in there that will be executed after a user with script, admin, or programming rights edited the page. Such a malicious script could impact the confidentiality, integrity and availability of the whole XWiki installation.
To reproduce, as a user without script right, create a class with a TextArea property, create page with an object of that class and a Velocity macro in its content. Then, as an admin, try editing that page. Normally, there should be a warning but in vulnerable versions of XWiki, there is no warning.
Patches
This vulnerability has been patched in XWiki 15.10.8 and 16.2.0.
Workarounds
We're not aware of any workarounds apart from not editing pages that might have been edited by untrusted users as a user with script rights, e.g., by using separate user accounts for admin and non-admin tasks.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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