What’s Vulnerable › Vulnerabilities

CVE-2021-33926

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-02-17 · updated 2026-06-17
• Weakness: CWE-918

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.

Affected products

• Plone CMS: 4.3, 4.3.1, 4.3.2, 4.3.3, 4.3.4, 4.3.5 (+46)

References

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

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