CVE-2021-33508

MEDIUMNVD 5.45.4—

5.4

Plone through 5.2.4 allows XSS via a full name that is mishandled during rendering of the ownership tab of a content item.

CVSS v3: 5.4
EG Score: 5.4(medium)
EPSS: 50.8%
KEV: Not listed

Published

May 21, 2021

Last Modified

November 21, 2024

References (4)

cve@mitrehttp://www.openwall.com/lists/oss-security/2021/05/22/1
cve@mitrehttps://plone.org/security/hotfix/20210518/stored-xss-from-user-fullname
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/05/22/1
af854a3a-2127-422b-91ae-364da2661108https://plone.org/security/hotfix/20210518/stored-xss-from-user-fullname

Patch Availability(1)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
pip	Plone	—	ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)

PyPI(1)

Package	Vulnerable range	Fixed in	Dependents
plone	3.2 ... 5.2rc5 (145 versions)	5.2.5	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-79Cross-site Scripting (XSS)

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 16:16 UTCEG score recompute
2026-05-26 16:16 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-33508?

CVE-2021-33508 is a medium vulnerability published on May 21, 2021. Plone through 5.2.4 allows XSS via a full name that is mishandled during rendering of the ownership tab of a content item.

When was CVE-2021-33508 disclosed?

CVE-2021-33508 was first published in the National Vulnerability Database on May 21, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-33508 actively exploited?

CVE-2021-33508 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 50.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-33508?

CVE-2021-33508 has a CVSS v3 base score of 5.4 (NVD).

How do I remediate CVE-2021-33508?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-33508, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-33508

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CVE-2021-33508

Published

Last Modified

References (4)

Patch Availability(1)

Affected Packages

Weakness Classification(1)

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-33508?

Same product

Same CWE

CVE-2021-33508

📅 Published

🔄 Last Modified

🔗 References (4)

Patch Availability(1)

Affected Packages

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-33508?

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Frequently asked(5)

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