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Vulnerability record · CVE-2021-33926 · published 17 February 2023

CVE-2021-33926: Plone server-side request forgery (ssrf) vulnerability

Plone · Plone

An issue in Plone CMS v. 5.2.4, 5.2.3, 5.2.2, 5.2.1, 5.2.0, 5.1rc2, 5.1rc1, 5.1b4, 5.1b3, 5.1b2, 5.1a2, 5.1a1, 5.1.7, 5.1.6, 5.1.5, 5.1.4, 5.1.2, 5.1.1 5.1, 5.0rc3, 5.0rc2, 5.0rc1, 5.0.9, 5.0.8, 5.0.7, 5.0.6, 5.0.5, 5.0.4, 5.0.3, 5.0.2, 5.0.10, 5.0.1, 5.0, 4.3.9, 4.3.8, 4.3.7, 4.3.6, 4.3.5, 4.3.4, 4.3.3, 4.3.20, 4 allows attacker to access sensitive information via the RSS feed protlet.

8.8 CVSS 3.1 High EPSS 1.0% · top 38.2% CWE-918 · Server-side request forgery (SSRF)
8.8CVSS 3.1 base score
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An issue in Plone CMS v. 5.2.4, 5.2.3, 5.2.2, 5.2.1, 5.2.0, 5.1rc2, 5.1rc1, 5.1b4, 5.1b3, 5.1b2, 5.1a2, 5.1a1, 5.1.7, 5.1.6, 5.1.5, 5.1.4, 5.1.2, 5.1.1 5.1, 5.0rc3, 5.0rc2, 5.0rc1, 5.0.9, 5.0.8, 5.0.7, 5.0.6, 5.0.5, 5.0.4, 5.0.3, 5.0.2, 5.0.10, 5.0.1, 5.0, 4.3.9, 4.3.8, 4.3.7, 4.3.6, 4.3.5, 4.3.4, 4.3.3, 4.3.20, 4 allows attacker to access sensitive information via the RSS feed protlet.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/s-kustm/Subodh/blob/master/Plone%205.2.4%20Vulnerable%20to%20bilend%20SSRF.pdf ExploitThird Party Advisory
https://plone.org/security/hotfix/20210518 Release Notes
https://plone.org/security/hotfix/20210518/blind-ssrf-via-feedparser-accessing-an-internal-url Vendor Advisory
https://github.com/s-kustm/Subodh/blob/master/Plone%205.2.4%20Vulnerable%20to%20bilend%20SSRF.pdf ExploitThird Party Advisory
https://plone.org/security/hotfix/20210518 Release Notes
https://plone.org/security/hotfix/20210518/blind-ssrf-via-feedparser-accessing-an-internal-url Vendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-33926), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.