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Medium

Cross-Site Scripting via Rich-Text Content

  • Disclosed: 19.08.2021
  • Updated: 11.10.2026 10:22

Meta

  • CVSS: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC (5.7)

Problem

Failing to properly parse, sanitize and encode malicious rich-text content, the content rendering process in the website frontend is vulnerable to cross-site scripting. Corresponding rendering instructions via TypoScript functionality HTMLparser do not consider all potentially malicious HTML tag & attribute combinations per default.

In addition, the lack of comprehensive default node configuration for rich-text fields in the backend user interface fosters this malfunction.

In default scenarios, a valid backend user account is needed to exploit this vulnerability. In case custom plugins used in the website frontend accept and reflect rich-text content submitted by users, no authentication is required.

Solution

Update to TYPO3 versions 7.6.53 ELTS, 8.7.42 ELTS, 9.5.29, 10.4.19, 11.3.2 that fix the problem described above.

Custom package typo3/html-sanitizer - based on allow-lists only - takes care of sanitizing potentially malicious markup. The default behavior is based on safe and commonly used markup - however, this can be extended or restricted further in case it is necessary for individual scenarios.

During the frontend rendering process, sanitization is applied to the default TypoScript path lib.parseFunc, which is implicitly used by the Fluid view-helper instruction f:format.html. Rich-text data persisted using the backend user interface is sanitized as well. Implementation details are explained in corresponding ChangeLog documentation.

Credits

Thanks to Benjamin Stiber, Gert-Jan Jansma, Gábor Ács-Kurucz, Alexander Kellner, Richie Lee, Nina Rösch who reported this issue, and to TYPO3 security team member Oliver Hader, as well as TYPO3 contributor Susanne Moog who fixed the issue.

References

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Composer package typo3/cms >= 10.0.0, < 10.4.19, >= 11.0.0, < 11.3.2, >= 9.0.0, < 9.5.29, >= 8.0.0, < 8.7.42, >= 7.0.0, < 7.6.53 10.4.19, 11.3.2, 9.5.29, 8.7.42, 7.6.53
Composer package typo3/cms-core >= 7.0.0, < 7.6.53, >= 8.0.0, < 8.7.42, >= 10.0.0, < 10.4.19, >= 11.0.0, < 11.3.2, >= 9.0.0, < 9.5.29 7.6.53, 8.7.42, 10.4.19, 11.3.2, 9.5.29

References

CVSS score 6.1/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE)
CWE-79
Platform
Composer
Package
typo3/cms, typo3/cms-core
Disclosed
19.08.2021
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-c5c9-8c6m-727v - CC BY 4.0

Vulnerability history: typo3/cms

All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (188) in the archive
Total entries
188
First → latest
09.2018 06.2024
Without a fix
3
Exploited in attacks
0

Severity breakdown

  • Critical 6
  • High 41
  • Medium 128
  • Low 13

Disclosures per year

Severity:
  1. TYPO3 Security Misconfiguration in Install Tool Cookie
    High · 8.1 ghsa-f777-f784-36gm >= 7.0.0, < 7.6.32, >= 8.0.0, < 8.7.21, >= 9.0.0, < 9.5.2 7.6.32, 8.7.21, 9.5.2
  2. TYPO3 Arbitrary Code Execution via File List Module
    High · 8.8 ghsa-8h4m-r4wm-xj7r >= 8.0.0, < 8.7.23, >= 9.0.0, < 9.5.4 8.7.23, 9.5.4
  3. TYPO3 Denial of Service in Frontend Record Registration
    High · 7.5 ghsa-g585-crjf-vhwq >= 7.0.0, < 7.6.32, >= 8.0.0, < 8.7.21 7.6.32, 8.7.21
  4. TYPO3 Security Misconfiguration for Backend User Accounts
    High · 7.3 ghsa-c5mj-39cf-3pp5 >= 8.0.0, < 8.7.23, >= 9.0.0, < 9.5.4 8.7.23, 9.5.4
  5. TYPO3 CMS Possible Insecure Deserialization in Extbase Request Handling
    High · 8.1 ghsa-hh95-5xm5-v8v7 >= 8.0.0, < 8.7.30, >= 9.0.0, < 9.5.12 8.7.30, 9.5.12
  6. Insecure Deserialization & Arbitrary Code Execution in TYPO3 CMS
    High ghsa-ppgf-8745-8pgx >= 7.0.0, < 7.6.30, >= 8.0.0, < 8.7.17, >= 9.0.0, < 9.3.2 7.6.30, 8.7.17, 9.3.2
  7. Privilege Escalation & SQL Injection in TYPO3 CMS
    High · 8.8 ghsa-7qwg-fcpw-xg5g >= 8.5.0, < 8.7.17, >= 9.0.0, < 9.3.2 8.7.17, 9.3.2
  8. TYPO3 Remote Code Execution in third party library swiftmailer
    High ghsa-g4pf-3jvq-2gcw >= 6.2.0, < 6.2.30, >= 7.6.0, < 7.6.15, >= 8.0.0, < 8.5.1 6.2.30, 7.6.15, 8.5.1
  9. Arbitrary Code Execution in TYPO3 CMS
    Critical · 9.9 ghsa-67wg-6j7r-mqh8 >= 7.6.0, < 7.6.22, >= 8.0.0, < 8.7.5 7.6.22, 8.7.5
  10. Insecure Deserialization in TYPO3 CMS
    High ghsa-8h28-f46f-m87h >= 8.5.0, < 8.7.17, >= 9.0.0, < 9.3.2 8.7.17, 9.3.2
  11. Missing Access Check in TYPO3 CMS
    Critical · 9.0 ghsa-gwfx-p7mr-f92v >= 6.2.0, < 6.2.25, >= 7.6.0, < 7.6.8, >= 8.0.0, < 8.1.1 6.2.25, 7.6.8, 8.1.1
  12. XML External Entity (XXE) Processing in TYPO3 Core
    High ghsa-qffc-gwpp-m2xr >= 6.2.0, < 6.2.19, >= 7.6.0, < 7.6.4 6.2.19, 7.6.4
  13. TYPO3 SQL Injection in dbal
    High ghsa-9895-53fc-98v2 >= 6.2.0, < 6.2.18 6.2.18
  14. TYPO3 frontend login vulnerable to Session Fixation
    High · 7.1 ghsa-r9vc-jfmh-6j48 >= 6.2.0, < 6.2.14, >= 7.0.0, < 7.3.1 6.2.14, 7.3.1
  15. TYPO3 may allow editors to change, create, or delete metadata of files not within their file mounts
    High · 8.8 ghsa-4r76-xr68-w7m7 >= 6.2.0, < 6.2.14, >= 7.0.0, < 7.3.1 6.2.14, 7.3.1
  16. TYPO3 possible cache poisoning on the homepage when anchors are used
    High ghsa-p84g-j2gh-83g3 >= 6.2.0, < 6.2.9, >= 7.0.0, < 7.0.2 6.2.9, 7.0.2
  17. TYPO3 Arbitrary Shell Execution in Swiftmailer library
    High · 8.1 ghsa-45xg-4w5x-j429 >= 6.2.0, < 6.2.6, >= 6.1.0, < 6.1.12, >= 4.7.0, < 4.7.20, >= 4.5.0, < 4.5.37 6.2.6, 6.1.12, 4.7.20, 4.5.37
  18. TYPO3 is vulnerable to Cross-Site Scripting via frontend rendering
    High · 8.8 CVE-2023-24814 >= 10.0.0, < 10.4.35, >= 11.0.0, < 11.5.23, >= 12.0.0, < 12.2.0 10.4.35, 11.5.23, 12.2.0
  19. TYPO3 vulnerable to Insufficient Session Expiration
    Critical · 9.8 CVE-2022-47406 < 2.0.5, >= 3.0.0, < 3.0.3 2.0.5, 3.0.3
  20. TYPO3 CMS vulnerable to Arbitrary Code Execution via Form Framework
    High · 7.5 CVE-2022-23503 >= 10.0.0, < 10.4.33, >= 11.0.0, < 11.5.20, >= 12.0.0, < 12.1.1 10.4.33, 11.5.20, 12.1.1
  21. TYPO3 Vulnerable to Insecure Deserialization
    High · 8.8 CVE-2019-12747 >= 8.0.0, < 8.7.27, >= 9.0.0, < 9.5.8 8.7.27, 9.5.8
  22. TYPO3 Image Processing susceptible to Code Execution
    High · 7.5 CVE-2019-11832 >= 8.0.0, < 8.7.25, >= 9.0.0, < 9.5.6 8.7.25, 9.5.6
  23. TYPO3 Insecure Deserialization in Query Generator & Query View
    High · 8.8 CVE-2019-19849 >= 10.0.0, < 10.2.1, >= 8.0.0, < 8.7.30, >= 9.0.0, < 9.5.12 10.2.1, 8.7.30, 9.5.12
  24. TYPO3 Remote File Disclosure vulnerability in the jumpUrl mechanism
    High CVE-2010-3714 >= 4.2.0, < 4.2.15, >= 4.3.0, < 4.3.7, >= 4.4.0, < 4.4.4 4.2.15, 4.3.7, 4.4.4
  25. TYPO3 vulnerable to remote authenticated arbitrary code execution
    High CVE-2013-4321 >= 6.0.0, < 6.0.9, >= 6.1.0, < 6.1.4 6.0.9, 6.1.4
  26. TYPO3 doesn't properly check file extensions
    High CVE-2013-4250 >= 6.0.0, < 6.0.8, >= 6.1.0, < 6.1.3 6.0.8, 6.1.3
  27. TYPO3 vulnerable to authentication bypass via leveraging knowledge of password hash
    Critical CVE-2014-3945 < 6.2.0 6.2.0
  28. Typo3 Vulnerable to Cache Poisoning
    High CVE-2014-9509 >= 4.5.0, < 4.5.39, >= 6.2.0, < 6.2.9, >= 7.0.0, < 7.0.2, >= 4.6.0, < 4.6.19, >= 4.7.0, < 4.7.21, >= 6.0.0, < 6.0.15, >= 6.1.0, < 6.1.13 4.5.39, 6.2.9, 7.0.2, 4.6.19, 4.7.21, 6.0.15, 6.1.13
  29. PHP OpenID Library Denial of Service vulnerability
    High CVE-2013-4701 >= 6.2.0, < 6.2.6 6.2.6
  30. TYPO3 Arbitrary Code Execution
    High · 8.8 CVE-2017-14251 >= 7.6.0, < 7.6.22, >= 8.0.0, < 8.7.5 7.6.22, 8.7.5
  31. TYPO3 Color Picker Wizard component allows remote authenticated editors to execute arbitrary PHP code
    High CVE-2014-3942 >= 4.5.0, < 4.5.34, >= 4.7.0, < 4.7.19, >= 6.0.0, < 6.0.14, >= 6.1.0, < 6.1.9 4.5.34, 4.7.19, 6.0.14, 6.1.9
  32. TYPO3 PHP remote file inclusion vulnerability
    High CVE-2010-1153 >= 4.3.0, < 4.3.3 4.3.3
  33. Indexed Search Engine for TYPO3 Command Execution via Metacharacter Injection
    High CVE-2009-0258 >= 4.0.0, < 4.0.10, >= 4.1.0, < 4.1.8, >= 4.2.0, < 4.2.4 4.0.10, 4.1.8, 4.2.4
  34. Authentication library in TYPO3 vulnerable to session fixation
    High CVE-2009-0256 >= 4.0.0, < 4.0.10, >= 4.1.0, < 4.1.8, >= 4.2.0, < 4.2.4 4.0.10, 4.1.8, 4.2.4
  35. TYPO3 Reveals Sensitive Information via Direct Request to `misc/phpcheck/`
    High CVE-2005-4875 < 3.8.1 3.8.1
  36. Typo3 SQL injection due to faulty prepared statements
    Critical · 9.8 CVE-2011-3583 >= 4.5.0, <= 4.5.5 no fix
  37. Typo3 Authentication Bypass
    Critical · 9.8 CVE-2011-4628 < 4.3.12, >= 4.4.0, < 4.4.9, >= 4.5.0, < 4.5.4 4.3.12, 4.4.9, 4.5.4
  38. Cross-Site-Request-Forgery in Backend
    High · 8.8 CVE-2021-41113 >= 11.2.0, < 11.5.0 11.5.0
  39. Cross-Site Scripting via Rich-Text Content this entry
    Medium · 6.1 CVE-2021-32768 >= 10.0.0, < 10.4.19, >= 11.0.0, < 11.3.2, >= 9.0.0, < 9.5.29, >= 8.0.0, < 8.7.42, >= 7.0.0, < 7.6.53 10.4.19, 11.3.2, 9.5.29, 8.7.42, 7.6.53
  40. Broken Access Control in Form Framework
    High · 8.3 CVE-2021-21357 >= 10.0.0, < 10.4.14, >= 11.0.0, < 11.1.1, >= 9.0.0, < 9.5.25 10.4.14, 11.1.1, 9.5.25
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