Vulnerability in Xwiki
CVE-2021-21379
XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. In affected versions of XWiki Platform, the `{{wikimacrocontent}}` executes the content with the rights of the wiki macro author instead of the caller of that wiki macro. This makes possible to inject scripts through it and they will be executed with the rights of the wiki macro (very often a user which has Programming rights). Fortunately, no such macro exists by default in XWiki Standard but one could have been created or installed with an extension. This vulnerability has been patched in versions XWiki 12.6.3, 11.10.11 and 12.8-rc-1. There is no easy workaround other than disabling the affected macros. Inserting content in a safe way or knowing what is the user who called the wiki macro is not easy.
EPSS: 0.005 (37.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N.
Affected products
- Xwiki
- Xwiki Xwiki-platform — versions >= 11.4.0, < 11.10.11, >= 12.0.0, < 12.6.3, >= 12.7.0, < 12.8-rc-1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
- security-advisories@github.com (x_refsource_MISC, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-21379?
- CVE-2021-21379 is a high-severity vulnerability in Xwiki, classified under Improper Preservation of Permissions. CVSS score: 7.7/10. Published 2021-03-12.
- How severe is CVE-2021-21379?
- High severity. CVSS v3 base score is 7.7 out of 10.