Vulnerability in org.xwiki.platform:xwiki-platform-rest-server (CVE-2026-33137)
Summary
Vulnerability in org.xwiki.platform:xwiki-platform-rest-server (CVE-2026-33137). Risk of unauthorized operations or information disclosure. Exploitable via POST /wikis/{wikiName}. Mitigation: upgrade to 18.1.0-rc-1 or later.
Original description
The description as published by the source.
XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. XWiki Platform is a generic wiki platform. In versions starting with 15.10.6 and prior to 18.1.0-rc-1, 17.10.3, 17.4.9, and 16.10.17, the POST /wikis/{wikiName} API executes a XAR import without performing any authentication or authorization checks, allowing an unauthenticated attacker to create or update documents in the target wiki. 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.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-33137 has been found in org.xwiki.platform:xwiki-platform-rest-server.
Attackers can target a specific entry point like POST /wikis/{wikiName} over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade org.xwiki.platform:xwiki-platform-rest-server to 18.1.0-rc-1 or later.
If unsure, ask your IT team or search "org.xwiki.platform:xwiki-platform-rest-server CVE-2026-33137" on the vendor's site.
CVE-2026-33137 (org.xwiki.platform:xwiki-platform-rest-server) — CWE-862
Attack surface: POST /wikis/{wikiName}
Patched: 18.1.0-rc-1 — apply immediately
Workaround: 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.
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-862) exists in org.xwiki.platform:xwiki-platform-rest-server. Attackers reach the vulnerable code path via POST /wikis/{wikiName}.
Check the vendor advisory for the affected versions of org.xwiki.platform:xwiki-platform-rest-server. Attack surface: POST /wikis/{wikiName}.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 18.1.0-rc-1.
Workaround: 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.
Search webserver/proxy logs for unusual POST /wikis/{wikiName} requests with malformed payloads or SQL meta-characters. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで org.xwiki.platform:xwiki-platform-rest-server を使っているサービスとバージョンを洗い出す。
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2Hunt for indicators of compromise detect
grep 'POST /wikis/{wikiName}' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで
POST /wikis/{wikiName}への異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。 -
3Apply temporary workaround mitigate
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.パッチが適用されるまでの応急処置として、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. を実施。回避策の副作用 (機能低下) を確認した上で。 -
4Apply patch patch
Upgrade org.xwiki.platform:xwiki-platform-rest-server to 18.1.0-rc-1ステージング環境で 18.1.0-rc-1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 2 で見つけた異常検知の続報チェックを含めること。
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5Post-deployment verification verify
Replay attack against POST /wikis/{wikiName} on staging to confirm patch closes the vectorパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 2 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- patch github.com
- web jira.xwiki.org
- web github.com