🛡️ CVE-2026-33137 — xwiki-platform-rest-server

🔴 CVSS 9.5 — Critical ✅ No Known Exploit CWE-862 NVD
9.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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:

Attribution

Reported by Sho Odagiri (GMO Cybersecurity by Ierae, Inc.).

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-33137 is classified as CWE-862: Missing Authorization. No authorisation check is performed before carrying out a restricted action.

Affected software

CVE-2026-33137 is recorded against 2 packages.

  • org.xwiki.platform:xwiki-platform-rest-server (from 18.0.0-rc-1 up to 18.1.0-rc-1)
  • unknown

Timeline and source

Published on 26 May 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)
jira.xwiki.org (Web)

Details

Severity CRITICAL
CVSS Score 9.5
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
CWE CWE-862
Public Exploit ✅ No
Source NVD
Published 2026-05-26
Updated 2026-08-12
Modified 2026-05-26
Fix URL N/A

Affected Packages

Software From version Fixed in
org.xwiki.platform:xwiki-platform-rest-server 18.0.0-rc-1 18.1.0-rc-1
unknown — —

Similar Threats

Exploit Protection

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