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TYPO3CMS

CVE-2023-24814

MEDIUM · 6.1 CVSS v3.1 Published 2023-02-07
Fix available
A fix is available. Upgrade to 9.5.40 / 9.7.51 or later.
See remediation →
68/100
Remediation priority · Elevated
Public exploit Remotely reachable No privileges 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
TYPO3 is a free and open source Content Management Framework released under the GNU General Public License. In affected versions the TYPO3 core component `GeneralUtility::getIndpEnv()` uses the unfiltered server environment variable `PATH_INFO`, which allows attackers to inject malicious content. In combination with the TypoScript setting `config.absRefPrefix=auto`, attackers can inject malicious HTML code to pages that have not been rendered and cached, yet. As a result, injected values would be cached and delivered to other website visitors (persisted cross-site scripting). Individual code which relies on the resolved value of `GeneralUtility::getIndpEnv('SCRIPT_NAME')` and corresponding usages (as shown below) are vulnerable as well. Additional investigations confirmed that at least Apache web server deployments using CGI (FPM, FCGI/FastCGI, and similar) are affected. However, there still might be the risk that other scenarios like nginx, IIS, or Apache/mod_php are vulnerable. The usage of server environment variable `PATH_INFO` has been removed from corresponding processings in `GeneralUtility::getIndpEnv()`. Besides that, the public property `TypoScriptFrontendController::$absRefPrefix` is encoded for both being used as a URI component and for being used as a prefix in an HTML context. This mitigates the cross-site scripting vulnerability. Users are advised to update to TYPO3 versions 8.7.51 ELTS, 9.5.40 ELTS, 10.4.35 LTS, 11.5.23 LTS and 12.2.0 which fix this problem. For users who are unable to patch in a timely manner the TypoScript setting `config.absRefPrefix` should at least be set to a static path value, instead of using auto - e.g. `config.absRefPrefix=/`. This workaround **does not fix all aspects of the vulnerability**, and is just considered to be an intermediate mitigation to the most prominent manifestation.

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-79

Untrusted input is placed into a web page without being neutralised, so an attacker's markup or script executes in another user's browser. That can hijack sessions, capture keystrokes, or silently perform actions as the victim. Fixing it properly means context-aware output encoding everywhere data meets HTML, backed by a content-security policy as a second line of defence.

General guidance for the cross-site scripting (xss) class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
TYPO3CMS
Affected:>= 8.7.0, < 9.7.51>= 9.0.0, < 9.5.40>= 10.0.0, < 10.4.36>= 11.0.0, < 11.5.23>= 12.0.0, < 12.2.0

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
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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
Upgrade available Upgrade to 9.5.40 / 9.7.51 / 10.4.36 or later
Fixed in 9.5.409.7.5110.4.36
Vendor patch github.com →
Recommended fix High confidence

TYPO3 8.7.51, 9.5.40, 10.4.36, 11.5.23, or 12.2.0+ depending on your current major version

  1. 1. Backup your TYPO3 installation and database before proceeding with the upgrade.
  2. 2. For TYPO3 v8.7.x: Upgrade to version 8.7.51 (ELTS).
  3. 3. For TYPO3 v9.x: Upgrade to version 9.5.40 (ELTS).
  4. 4. For TYPO3 v10.x: Upgrade to version 10.4.36 (LTS).
  5. 5. For TYPO3 v11.x: Upgrade to version 11.5.23 (LTS).
  6. 6. Alternatively, upgrade to TYPO3 v12.2.0 or later for the latest stable release.
  7. 7. After upgrade, clear all caches via Install Tool > Maintenance > Flush Caches.
  8. 8. Verify the TypoScript setting 'config.absRefPrefix' - if using 'auto', consider changing to a static path (e.g., '/') as an additional hardening measure, though the core fix addresses the underlying vulnerability.
Caveat TYPO3 upgrades between major versions (e.g., 9.x to 10.x, 10.x to 11.x) may have breaking changes; review release notes and test in staging environment before production deployment

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

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $900. Get the upgrade done

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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

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