GHSA-qrvh-r3f2-9h4r XWiki Platform has an Unauthenticated XAR Import via REST /wikis/{wikiName}

• Maven org.xwiki.platform:xwiki-platform-rest-server: >= 15.10.6, < 16.10.17 → fixed in 16.10.17 • Maven org.xwiki.platform:xwiki-platform-rest-server: >= 17.0.0-rc-1, < 17.4.9 → fixed in 17.4.9 • Maven org.xwiki.platform:xwiki-platform-rest-server: >= 17.5.0, < 17.10.3 → fixed in 17.10.3 • Maven org.xwiki.platform:xwiki-platform-rest-server: >= 18.0.0-rc-1, < 18.1.0-rc-1 → fixed in 18.1.0-rc-1

Impact `POST /wikis/{wikiName}` executes a XAR import without performing any authentication or authorization checks, allowing an unauthenticated attacker to create or update documents in the target wiki Patches This vulnerability has been patched in XWiki 16.10.17, 17.4.9, 17.10.3, 18.0.1 and 18.1.0-rc-1. Workarounds XWiki is not aware of any workarounds other than adding a rule into an HTTP proxy to prevent access POST request in the `/wikis/{wikiName}[/]` endpoint. Resources • https://jira.xwiki.org/browse/XWIKI-23953 • https://github.com/xwiki/xwiki-platform/commit/4b7b95b79256374d487e9ece1dc48f527966990f For more information If there are any questions or comments about this advisory: • Open an issue in Jira XWiki.org • Send an email to the Security Mailing List Attribution Reported by Sho Odagiri (GMO Cybersecurity by Ierae, Inc.).