CVE-2021-3313
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| PyPI | plone | <5.2.4 | 5.2.4 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-3313
- https://github.com/plone/Plone
- https://github.com/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2021-78.yaml
- https://plone.org/download/releases/5.2.3
- https://plone.org/security/hotfix/20210518
- https://plone.org/security/hotfix/20210518/stored-xss-from-file-upload-svg-html
- https://plone.org/security/hotfix/20210518/stored-xss-from-user-fullname
- https://www.compass-security.com/fileadmin/Research/Advisories/2021-07_CSNC-2021-013_XSS_in_Plone_CMS.txt
- http://www.openwall.com/lists/oss-security/2021/05/22/1
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.