CVE-2026-33137Network attack vector

Unauthenticated document modification via REST XAR import

Published May 20, 2026 · Updated May 20, 2026

Missing authorization in XWiki Platform allows remote attackers to create or update wiki documents through an unauthenticated REST request. The WikiResourceImpl.importXAR method accepts POST /wikis/{wikiName} and starts a XAR import without checking authentication or ADMIN rights. Any network client that can reach the REST endpoint can overwrite or add documents in the selected existing wiki, while the published impact does not establish code execution.

CVSS severity9.3
Critical
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in XWiki Platform allows remote attackers to create or update wiki documents through an unauthenticated REST request. The WikiResourceImpl.importXAR method accepts POST /wikis/{wikiName} and starts a XAR import without checking authentication or ADMIN rights. Any network client that can reach the REST endpoint can overwrite or add documents in the selected existing wiki, while the published impact does not establish code execution.

The record

CVE
CVE-2026-33137
Published
May 20, 2026
Updated
May 20, 2026
Vendor
CryptPad
Product
XWiki Platform
Classifications
CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 20, 2026CVE publishedPublication date reported by the CVE source.
  2. May 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 16.10.17
  2. Affected versionversion=>= 17.0.0-rc-1, < 17.4.9
  3. Affected versionversion=>= 17.5.0, < 17.10.3
  4. Affected versionversion=>= 18.0.0-rc-1, < 18.1.0-rc-1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CryptPad · XWiki Platformversion=< 16.10.17; version=>= 17.0.0-rc-1, < 17.4.9; version=>= 17.5.0, < 17.10.3; version=>= 18.0.0-rc-1, < 18.1.0-rc-1

Published CVSS scores

9.3GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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