CVE-2021-32735

Cross-site scripting (XSS) from field and configuration text displayed in the Panel

MEDIUM
5.4
CVSS Score
Published: July 2, 2021 at 02:45 PM UTC
Updated: June 17, 2026 at 03:53 AM UTC
1 product affected across 1 vendorKirby

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.5%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

95%
v ≤ 3.5.5v < 3.5.7
Affected range stops below 3.5.7, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (2)

x_refsource_MISCPatchRelease NotesThird Party Advisory
https://github.com/getkirby/kirby/releases/tag/3.5.7
x_refsource_CONFIRMPatchRelease NotesThird Party Advisory
https://github.com/getkirby/kirby/security/advisories/GHSA-2f2w-349x-vrqm

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-80CWE-79

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