XSS in Getkirby Kirby
CVE-2021-32735
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.005 (43.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Getkirby Kirby — versions <= 3.5.5, <= 3.5.6
Weakness classification (CWE)
References
- github.com/getkirby/kirby/security/advisories/GHSA-2f2w-349x-vrqm (Patch, Third Party Advisory, Release Notes)
- github.com/getkirby/kirby/releases/tag/3.5.7 (Patch, Third Party Advisory, Release Notes)
Frequently asked questions
- What is CVE-2021-32735?
- CVE-2021-32735 is a high-severity vulnerability in Getkirby Kirby, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 7.1/10. Published 2021-07-02.
- How severe is CVE-2021-32735?
- High severity. CVSS v3 base score is 7.1 out of 10.