CVE-2021-35959 json
Plone has stored XSS in folder contents
published 2021-06-30 5 y ago modified 2026-06-17 4 mo ago also GHSA-qfhw-fv3g-v836 , PYSEC-2021-110 , EUVD-2021-0187
- cvss
- 5.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 45%
- public exploits
- 0
- none known
Summary
In Plone 5.0 through 5.2.4, Editors are vulnerable to XSS in the folder contents view, if a Contributor has created a folder with a SCRIPT tag in the description field.
Patch / fix
- pypi plone 5.2.5
Exploit prediction
0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 3.5 | AV:N/AC:M/Au:S/C:N/I:P/A:N |
| GitHub | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | plone | >=5.0, <=5.2.4 >=5.0, <5.2.5 |
5.2.5 |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
plone.org
/security/hotfix/20210518/stored-xss-in-folder-contents
web, vendor-advisory
-
openwall.com
/lists/oss-security/2021/06/30/2
mailing-list, web, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-35959
advisory
-
github.com
/plone/Plone
package
-
github.com
/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2021-110.yaml
web
-
github.com
/advisories/GHSA-qfhw-fv3g-v836
advisory
Sources
- CVE List CVE-2021-35959
- GitHub Advisory GHSA-qfhw-fv3g-v836
- NVD CVE-2021-35959
- OSV PYSEC-2021-110
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.