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CVE-2021-33926: Server-Side Request Forgery in Plone CMS

February 17, 2023 (updated March 19, 2025)

An issue in Plone CMS allows attacker to access sensitive information via the RSS feed protlet.

References

  • github.com/advisories/GHSA-47p5-p3jw-w78w
  • github.com/plone/Plone
  • github.com/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2023-289.yaml
  • github.com/s-kustm/Subodh/blob/master/Plone%205.2.4%20Vulnerable%20to%20bilend%20SSRF.pdf
  • nvd.nist.gov/vuln/detail/CVE-2021-33926
  • plone.org/security/hotfix/20210518
  • plone.org/security/hotfix/20210518/blind-ssrf-via-feedparser-accessing-an-internal-url

Code Behaviors & Features

Detect and mitigate CVE-2021-33926 with GitLab Dependency Scanning

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Affected versions

All versions starting from 4.3 before 5.2.5

Fixed versions

  • 5.2.5

Solution

Upgrade to version 5.2.5 or above.

Impact 8.8 HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Learn more about CVSS

Weakness

  • CWE-918: Server-Side Request Forgery (SSRF)

Source file

pypi/Plone/CVE-2021-33926.yml

Spotted a mistake? Edit the file on GitLab.

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