Vulnerability · Published May 20, 2021 · Assigned by mitre

CVE-2021-3313

Medium 5.4

In plain English

A medium-severity security flaw in the plone package (PyPI). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 62% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.4Medium

Exploit odds (30 days)1.0%top 37.7% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	plone	5.2.4	GHSA-hprr-4vfq-fcxw
PyPI	plone	5.2.4	PYSEC-2021-78

Affected products (as reported)

Vendor	Product	Versions
n/a	n/a	n/a

References

https://plone.org/download/releases/5.2.3 x_refsource_MISC
https://www.compass-security.com/fileadmin/Research/Advisories/2021-07_CSNC-2021-013_XSS_in_Plone_CMS.txt x_refsource_MISC
https://plone.org/security/hotfix/20210518 x_refsource_MISC
[oss-security] 20210522 Re: Plone security hotfix 20210518 mailing-list, x_refsource_MLIST