CVE-2021-21358 json
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in typo3/cms-form
published 2021-03-23 5 y ago modified 2026-07-08 4 mo ago also BIT-typo3-2021-21358 , EUVD-2021-0722 , GHSA-x79j-wgqv-g8h2
- cvss
- 5.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 59%
- public exploits
- 0
- none known
Summary
TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 10.4.14, 11.1.1 it has been discovered that the Form Designer backend module of the Form Framework is vulnerable to cross-site scripting. A valid backend user account with access to the form module is needed to exploit this vulnerability. This is fixed in versions 10.4.14, 11.1.1.
Patch / fix
- packagist typo3/cms-form 10.4.14, 11.1.1
- packagist typo3/cms-core 10.4.14, 11.1.1
- packagist typo3/cms 10.4.14, 11.1.1
- bitnami typo3 10.4.14, 11.1.1
- typo3 typo3 10.4.14, 11.1.1
Exploit prediction
0.87% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| GitHub | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C |
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 3.5 | AV:N/AC:M/Au:S/C:N/I:P/A:N |
| OSV | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | typo3/cms-form | >=10.2.0, <10.4.14 >=11.0.0, <11.1.1 |
10.4.14 11.1.1 |
| packagist | typo3/cms-core | >=10.0.0, <10.4.14 >=11.0.0, <11.1.1 |
10.4.14 11.1.1 |
| packagist | typo3/cms | >=10.0.0, <10.4.14 >=11.0.0, <11.1.1 |
10.4.14 11.1.1 |
| bitnami | typo3 | >=10.2.0, <10.4.14 >=11.0.0, <11.1.1 |
10.4.14 11.1.1 |
Affected products
- TYPO3 TYPO3.CMS
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
typo3.org
/security/advisory/typo3-core-sa-2021-004
web, vendor-advisory
-
github.com
/TYPO3/TYPO3.CMS/security/advisories/GHSA-x79j-wgqv-g8h2
web, third-party-advisory
-
packagist.org
/packages/typo3/cms-form
web, release-notes, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-21358
advisory
-
github.com
/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-21358.yaml
web
-
github.com
/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-21358.yaml
web
Sources
- CVE List CVE-2021-21358
- GitHub Advisory GHSA-x79j-wgqv-g8h2
- NVD CVE-2021-21358
- OSV BIT-typo3-2021-21358
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