CVE-2021-29459

Description

### Impact It is possible to persistently inject scripts in XWiki. For unregistred users: - By filling simple text fields For registered users: - By filling their personal information - (if they have edit rights) By filling the values of static lists using App Within Minutes That can lead to user's session hijacking, and if used in conjunction with a social engineering attack it can also lead to disclosure of sensitive data, CSRF attacks and other security vulnerabilities. That can also lead to the attacker taking over an account. If the victim has administrative rights it might even lead to code execution on the server, depending on the application and the privileges of the account. ### Patches It has been patched on XWiki 12.8 and 12.6.3. ### Workarounds There is no easy workaround except upgrading XWiki. ### References https://jira.xwiki.org/browse/XWIKI-17374 ### For more information If you have any questions or comments about this advisory: * Open an issue in [Jira XWiki](https://jira.xwiki.org) * Email us at our [security mailing list](mailto:security@xwiki.org)

How to fix CVE-2021-29459

To remediate CVE-2021-29459, upgrade the affected package to a fixed version below.

• —upgrade to 12.6.3 or later
• —upgrade to 12.6.3 or later

Is CVE-2021-29459 being exploited?

Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 12.6.3
• from 0, < 12.6.3

CVSS scores

References (2)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-29459
• WEBgithub.com/xwiki/xwiki-platform/security/advisories/GHSA-5c66-v29h-xjh8