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Vulnerability details: VCID-dhrm-uxuv-zfaj
Vulnerability ID VCID-dhrm-uxuv-zfaj
Aliases CVE-2021-21358
GHSA-x79j-wgqv-g8h2
Summary Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in typo3/cms-form ### Problem 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. ### Solution Update to TYPO3 versions 10.4.14 or 11.1.1 that fix the problem described. ### Credits Thanks to Richie Lee who reported this issue and to TYPO3 framework merger Andreas Fernandez who fixed the issue. ### References * [TYPO3-CORE-SA-2021-004](https://typo3.org/security/advisory/typo3-core-sa-2021-004)
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00379 https://api.first.org/data/v1/epss?cve=CVE-2021-21358
epss 0.00379 https://api.first.org/data/v1/epss?cve=CVE-2021-21358
epss 0.00379 https://api.first.org/data/v1/epss?cve=CVE-2021-21358
epss 0.00379 https://api.first.org/data/v1/epss?cve=CVE-2021-21358
epss 0.00379 https://api.first.org/data/v1/epss?cve=CVE-2021-21358
epss 0.00379 https://api.first.org/data/v1/epss?cve=CVE-2021-21358
epss 0.00379 https://api.first.org/data/v1/epss?cve=CVE-2021-21358
epss 0.00379 https://api.first.org/data/v1/epss?cve=CVE-2021-21358
epss 0.00379 https://api.first.org/data/v1/epss?cve=CVE-2021-21358
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-x79j-wgqv-g8h2
cvssv3.1 5.4 https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-21358.yaml
generic_textual MODERATE https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-21358.yaml
cvssv3.1 5.4 https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-21358.yaml
generic_textual MODERATE https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-21358.yaml
cvssv3.1 5.4 https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-x79j-wgqv-g8h2
cvssv3.1_qr MODERATE https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-x79j-wgqv-g8h2
generic_textual MODERATE https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-x79j-wgqv-g8h2
cvssv3.1 5.4 https://nvd.nist.gov/vuln/detail/CVE-2021-21358
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-21358
cvssv3.1 5.4 https://packagist.org/packages/typo3/cms-form
generic_textual MODERATE https://packagist.org/packages/typo3/cms-form
cvssv3.1 5.4 https://typo3.org/security/advisory/typo3-core-sa-2021-004
generic_textual MODERATE https://typo3.org/security/advisory/typo3-core-sa-2021-004
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-21358
https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-21358.yaml
https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-21358.yaml
https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-x79j-wgqv-g8h2
https://nvd.nist.gov/vuln/detail/CVE-2021-21358
https://packagist.org/packages/typo3/cms-form
https://typo3.org/security/advisory/typo3-core-sa-2021-004
GHSA-x79j-wgqv-g8h2 https://github.com/advisories/GHSA-x79j-wgqv-g8h2
No exploits are available.
Vector: 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 Found at https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-21358.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: 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 Found at https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-21358.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: 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 Found at https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-x79j-wgqv-g8h2
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: 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 Found at https://nvd.nist.gov/vuln/detail/CVE-2021-21358
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: 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 Found at https://packagist.org/packages/typo3/cms-form
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: 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 Found at https://typo3.org/security/advisory/typo3-core-sa-2021-004
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.59338
EPSS Score 0.00379
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T13:01:50.335505+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/03/GHSA-x79j-wgqv-g8h2/GHSA-x79j-wgqv-g8h2.json 38.0.0