CVE-2021-32735Network attack vector

Privilege escalation via unescaped Panel text

Published Jul 2, 2021 · Updated Aug 3, 2024

Stored cross-site scripting in Kirby CMS 3.5.5 through 3.5.6 allows remote authenticated users to execute JavaScript in Panel sessions. The Panel's ListItem component and translated messages render attacker-controlled page titles, filenames, and placeholder values as HTML without escaping dynamic data. Panel access is normally required, but remote attackers can inject content when a frontend form writes site data; execution can issue API requests with the victim's permissions.

CVSS severity7.1
High
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Kirby CMS 3.5.5 through 3.5.6 allows remote authenticated users to execute JavaScript in Panel sessions. The Panel's ListItem component and translated messages render attacker-controlled page titles, filenames, and placeholder values as HTML without escaping dynamic data. Panel access is normally required, but remote attackers can inject content when a frontend form writes site data; execution can issue API requests with the victim's permissions.

The record

CVE
CVE-2021-32735
Published
Jul 2, 2021
Updated
Aug 3, 2024
Vendor
Content Folder
Product
Kirby
Classifications
CWE-79, CWE-80, T1059.007
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 3.5.5, <= 3.5.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Content Folder · Kirbyversion=<= 3.5.5, <= 3.5.6

Published CVSS scores

5.4NISTCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
7.1GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
3.5NISTAV:N/AC:M/Au:S/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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