XSS in Plone
CVE-2021-3313
Plone CMS until version 5.2.4 has a stored Cross-Site Scripting (XSS) vulnerability in the user fullname property and the file upload functionality. The user's input data is not properly encoded when being echoed back to the user. This data can be interpreted as executable code by the browser and allows an attacker to execute JavaScript in the context of the victim's browser if the victim opens a vulnerable page containing an XSS payload.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.010 (60.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
Weakness classification (CWE)
References
- plone.org/download/releases/5.2.3 (Release Notes, Vendor Advisory)
- www.compass-security.com/fileadmin/Research/Advisories/2021-07_CSNC-2021-013_XS… (Exploit, Third Party Advisory)
- plone.org/security/hotfix/20210518 (Vendor Advisory)
- www.openwall.com/lists/oss-security/2021/05/22/1 (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-3313?
- CVE-2021-3313 is a medium-severity vulnerability in Plone, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-05-20.
- How severe is CVE-2021-3313?
- Medium severity. CVSS v3 base score is 5.4 out of 10.