XWiki Platform has an Unauthenticated XAR Import via REST /wikis/{wikiName}
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.).
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.xwiki.platform:xwiki-platform-rest-server | >= 15.10.6, < 16.10.17, >= 17.0.0-rc-1, < 17.4.9, >= 17.5.0, < 17.10.3, >= 18.0.0-rc-1, < 18.1.0-rc-1 | 16.10.17, 17.4.9, 17.10.3, 18.1.0-rc-1 |
References
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-862- Platform
- Java / Kotlin (Maven)
- Package
org.xwiki.platform:xwiki-platform-rest-server- Disclosed
- 26.05.2026
- Updated
- 11.10.2026 12:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-qrvh-r3f2-9h4r - CC BY 4.0
Vulnerability history: org.xwiki.platform:xwiki-platform-rest-server
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 11
- First → latest
- 11.2022 05.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 4
- High 4
- Medium 3
Disclosures per year
- 2022: 1
- 2023: 2
- 2024: 1
- 2025: 6
- 2026: 1
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XWiki Platform has an Unauthenticated XAR Import via REST /wikis/{wikiName} this entry
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