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CVE-2025-53837 critical CVSS 9.9

Vulnerability in org.xwiki.rendering:xwiki-rendering-xml (CVE-2025-53837)

Summary

Vulnerability in org.xwiki.rendering:xwiki-rendering-xml (CVE-2025-53837). Successful exploitation can lead to full system takeover. Exploitable via XWiki.UIExtensionClass. Mitigation: upgrade to 14.10.2 or later.

Original description

The description as published by the source.

XWiki Rendering is a generic rendering system that converts textual input in a given syntax (wiki syntax, HTML, etc) into another syntax (XHTML, etc). Prior to versions 14.10.2 and 15.0 RC1, any user who can edit their own user profile or any other document can execute arbitrary script macros including Groovy and Python macros that allow remote code execution including unrestricted read and write access to all wiki contents. The reason is that rendering output is included as content of HTML macros without further escaping and it is thus possible to close the HTML macro and inject script macros that are executed with programming rights. This has been patched in XWiki 14.10.2 and 15.0 RC1 by making sure that rendering output cannot close the surrounding HTML macro. A possible workaround is available. It is, in principle, possible to add escaping to all places where rendering output is used in wiki documents, but at the moment there is no list of them.

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-2025-53837 has been found in org.xwiki.rendering:xwiki-rendering-xml.
Attackers can target a specific entry point like XWiki.UIExtensionClass over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 9.9/10.
What to do: upgrade org.xwiki.rendering:xwiki-rendering-xml to 14.10.2 or later.
If unsure, ask your IT team or search "org.xwiki.rendering:xwiki-rendering-xml CVE-2025-53837" on the vendor's site.

CVE-2025-53837 (org.xwiki.rendering:xwiki-rendering-xml) — CWE-95 / CVSS v3 9.9
Attack vector: remote (network-reachable) / no user interaction
Attack surface: XWiki.UIExtensionClass / org.xwiki.platform.html.head / org.xwiki.myuser.test
Patched: 14.10.2 — apply immediately
Workaround: It is in principle possible to add escaping to all places where rendering output is used in wiki documents but at the moment there is no list of them.
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.

❓ What is the problem

A vulnerability (CWE-95) exists in org.xwiki.rendering:xwiki-rendering-xml. Attackers reach the vulnerable code path via XWiki.UIExtensionClass.

📍 Affected scope

Check the vendor advisory for the affected versions of org.xwiki.rendering:xwiki-rendering-xml. Attack surface: XWiki.UIExtensionClass / org.xwiki.platform.html.head / org.xwiki.myuser.test.

🔥 Severity

Severity: Critical (CVSS 9.9/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 14.10.2.

🛡️ Workaround

Workaround: It is in principle possible to add escaping to all places where rendering output is used in wiki documents but at the moment there is no list of them.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで org.xwiki.rendering:xwiki-rendering-xml を使っているサービスとバージョンを洗い出す。

  2. 2
    Apply temporary workaround mitigate 
    It is in principle possible to add escaping to all places where rendering output is used in wiki documents but at the moment there is no list of them.

    パッチが適用されるまでの応急処置として、It is in principle possible to add escaping to all places where rendering output is used in wiki documents but at the moment there is no list of them. を実施。回避策の副作用 (機能低下) を確認した上で。

  3. 3
    Apply patch patch 
    Upgrade org.xwiki.rendering:xwiki-rendering-xml to 14.10.2

    ステージング環境で 14.10.2 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を含めること。

  4. 4
    Post-deployment verification verify 
    Confirm patched version is live in production

    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。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

maven org.xwiki.rendering:xwiki-rendering-xml
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"14.10.2"}]}]

References

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