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Vulnerability details: VCID-6zd1-91p6-tkfm
Vulnerability ID VCID-6zd1-91p6-tkfm
Aliases CVE-2021-32735
GHSA-2f2w-349x-vrqm
Summary Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Kirby is a content management system. In Kirby CMS versions 3.5.5 and 3.5.6, the Panel's `ListItem` component (used in the pages and files section for example) displayed HTML in page titles as it is. This could be used for cross-site scripting (XSS) attacks. Malicious authenticated Panel users can escalate their privileges if they get access to the Panel session of an admin user. Visitors without Panel access can use the attack vector if the site allows changing site data from a frontend form. Kirby 3.5.7 patches the vulnerability. As a partial workaround, site administrators can protect against attacks from visitors without Panel access by validating or sanitizing provided data from the frontend form.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
System Score Found at
epss 0.00383 https://api.first.org/data/v1/epss?cve=CVE-2021-32735
epss 0.00383 https://api.first.org/data/v1/epss?cve=CVE-2021-32735
cvssv3.1 7.1 https://github.com/getkirby/kirby
generic_textual HIGH https://github.com/getkirby/kirby
cvssv3.1 7.1 https://github.com/getkirby/kirby/commit/f5ead62f8510158bed5baf58ca0e851875778a09
generic_textual HIGH https://github.com/getkirby/kirby/commit/f5ead62f8510158bed5baf58ca0e851875778a09
cvssv3.1 7.1 https://github.com/getkirby/kirby/releases/tag/3.5.7
generic_textual HIGH https://github.com/getkirby/kirby/releases/tag/3.5.7
cvssv3.1 7.1 https://github.com/getkirby/kirby/security/advisories/GHSA-2f2w-349x-vrqm
generic_textual HIGH https://github.com/getkirby/kirby/security/advisories/GHSA-2f2w-349x-vrqm
cvssv3.1 7.1 https://nvd.nist.gov/vuln/detail/CVE-2021-32735
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2021-32735
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-32735
https://github.com/getkirby/kirby
https://github.com/getkirby/kirby/commit/f5ead62f8510158bed5baf58ca0e851875778a09
https://github.com/getkirby/kirby/releases/tag/3.5.7
CVE-2021-32735 https://nvd.nist.gov/vuln/detail/CVE-2021-32735
GHSA-2f2w-349x-vrqm https://github.com/advisories/GHSA-2f2w-349x-vrqm
GHSA-2f2w-349x-vrqm https://github.com/getkirby/kirby/security/advisories/GHSA-2f2w-349x-vrqm
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N Found at https://github.com/getkirby/kirby
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:N/S:U/C:H/I:L/A:N Found at https://github.com/getkirby/kirby/commit/f5ead62f8510158bed5baf58ca0e851875778a09
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:N/S:U/C:H/I:L/A:N Found at https://github.com/getkirby/kirby/releases/tag/3.5.7
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:N/S:U/C:H/I:L/A:N Found at https://github.com/getkirby/kirby/security/advisories/GHSA-2f2w-349x-vrqm
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:N/S:U/C:H/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-32735
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 0.5994
EPSS Score 0.00383
Published At June 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-02T04:39:27.103622+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/getkirby/cms/CVE-2021-32735.yml 38.6.0