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XML External Entity (XXE)Weakness · CWE-611

CVE-2025-47778

MEDIUM · 6.1 CVSS v4.0 Published 2025-05-14
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
67/100
Remediation priority · Elevated
Remotely reachable Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Sulu is an open-source PHP content management system based on the Symfony framework. Starting in versions 2.5.21, 2.6.5, and 3.0.0-alpha1, an admin user can upload SVG which may load external data via XML DOM library. This can be used for insecure XML External Entity References. The problem has been patched in versions 2.6.9, 2.5.25, and 3.0.0-alpha3. As a workaround, one may patch the effect file `src/Sulu/Bundle/MediaBundle/FileInspector/SvgFileInspector.php` manually.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-611

An XML parser processes external entity references inside untrusted documents, letting an attacker read local files, reach internal systems, or exhaust resources. It's a common trap in anything that accepts XML. The fix is to disable external entities and DTD processing in the parser.

General guidance for the xml external entity (xxe) class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
High
Authentication
X
User interaction
None
Scope
X

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix High confidence

2.5.25, 2.6.9, or 3.0.0-alpha3 depending on your current major version

  1. Identify current Sulu version by checking composer.json or the installed package version
  2. For Sulu 2.5.x: Upgrade to version 2.5.25 or later by running: composer require sulu/sulu:^2.5.25 --no-interaction --no-progress
  3. For Sulu 2.6.x: Upgrade to version 2.6.9 or later by running: composer require sulu/sulu:^2.6.9 --no-interaction --no-progress
  4. For Sulu 3.0.0-alpha1/alpha2: Upgrade to version 3.0.0-alpha3 by running: composer require sulu/sulu:^3.0.0-alpha3 --no-interaction --no-progress
  5. After upgrading, clear the Symfony cache: bin/console cache:clear
  6. Verify the fix by testing SVG file uploads in the admin panel to confirm external entities are not processed
  7. If using a custom fork, alternatively apply the vendor patch from commit 02f52fca04eb9495b9b4a0c5cc64cf23bc27f544 to src/Sulu/Bundle/MediaBundle/FileInspector/SvgFileInspector.php
Caveat Minor/patch upgrades typically have minimal breaking changes; review the Sulu changelog for any deprecation notices between your version and the target version

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-47778 in production — separate from our analysis above.

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