Plone vulnerabilities: known CVEs & security history
Plone · CMS · 105 tracked CVEs · 0 actively exploited · updated June 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Plone release lines — 105 in total. A CVE here doesn't mean your version is affected — check Plone's current status and the safe version to run.
Known Plone CVEs
Actively-exploited and most-severe first. Showing the top 80 of 105. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2021-33509 | critical | 9.9 | 2% | 2021 |
| CVE-2020-35190 | critical | 9.8 | 2% | 2020 |
| CVE-2020-7941 | critical | 9.8 | 2% | 2020 |
| CVE-2011-4030 | high | 9.3 | 2% | 2011 |
| CVE-2011-3587 | high | 9.3 | 79% | 2011 |
| CVE-2021-33926 | high | 8.8 | 1% | 2023 |
| CVE-2020-28736 | high | 8.8 | 1% | 2020 |
| CVE-2020-28735 | high | 8.8 | 1% | 2020 |
| CVE-2020-28734 | high | 8.8 | 1% | 2020 |
| CVE-2020-7939 | high | 8.8 | 1% | 2020 |
| CVE-2020-7938 | high | 8.8 | 1% | 2020 |
| CVE-2015-7293 | high | 8.8 | 3% | 2017 |
| CVE-2012-5493 | high | 8.5 | 2% | 2014 |
| CVE-2012-5487 | high | 8.5 | 2% | 2014 |
| CVE-2024-22889 | high | 7.5 | 1% | 2024 |
| CVE-2024-23756 | high | 7.5 | 1% | 2024 |
| CVE-2021-33511 | high | 7.5 | 1% | 2021 |
| CVE-2020-7940 | high | 7.5 | 1% | 2020 |
| CVE-2015-7318 | high | 7.5 | 2% | 2017 |
| CVE-2011-2528 | high | 7.5 | 2% | 2011 |
| CVE-2011-0720 | high | 7.5 | 3% | 2011 |
| CVE-2007-5741 | high | 7.5 | 2% | 2007 |
| CVE-2016-4041 | high | 7.3 | 1% | 2017 |
| CVE-2021-32633 | medium | 6.8 | 2% | 2021 |
| CVE-2015-7317 | medium | 6.8 | 2% | 2017 |
| CVE-2012-5485 | medium | 6.8 | 2% | 2014 |
| CVE-2021-21336 | medium | 6.5 | 2% | 2021 |
| CVE-2017-1000483 | medium | 6.5 | 1% | 2018 |
| CVE-2012-5489 | medium | 6.5 | 1% | 2014 |
| CVE-2013-4189 | medium | 6.5 | 1% | 2014 |
| CVE-2012-5486 | medium | 6.4 | 2% | 2014 |
| CVE-2006-4247 | medium | 6.4 | 1% | 2006 |
| CVE-2024-0669 | medium | 6.3 | 0% | 2024 |
| CVE-2021-33507 | medium | 6.1 | 1% | 2021 |
| CVE-2020-7936 | medium | 6.1 | 1% | 2020 |
| CVE-2013-7062 | medium | 6.1 | 1% | 2020 |
| CVE-2017-1000484 | medium | 6.1 | 1% | 2018 |
| CVE-2017-1000481 | medium | 6.1 | 1% | 2018 |
| CVE-2015-7316 | medium | 6.1 | 1% | 2017 |
| CVE-2016-7140 | medium | 6.1 | 2% | 2017 |
| CVE-2016-7139 | medium | 6.1 | 2% | 2017 |
| CVE-2016-7138 | medium | 6.1 | 2% | 2017 |
| CVE-2016-7137 | medium | 6.1 | 2% | 2017 |
| CVE-2016-7136 | medium | 6.1 | 2% | 2017 |
| CVE-2016-7147 | medium | 6.1 | 1% | 2017 |
| CVE-2009-0662 | medium | 6 | 1% | 2009 |
| CVE-2015-7315 | medium | 5.9 | 2% | 2017 |
| CVE-2013-4195 | medium | 5.8 | 1% | 2014 |
| CVE-2013-4191 | medium | 5.8 | 1% | 2014 |
| CVE-2013-4200 | medium | 5.8 | 2% | 2014 |
| CVE-2013-7061 | medium | 5.5 | 1% | 2014 |
| CVE-2013-4197 | medium | 5.5 | 1% | 2014 |
| CVE-2011-1950 | medium | 5.5 | 2% | 2011 |
| CVE-2021-35959 | medium | 5.4 | 1% | 2021 |
| CVE-2021-33513 | medium | 5.4 | 1% | 2021 |
| CVE-2021-33512 | medium | 5.4 | 1% | 2021 |
| CVE-2021-33508 | medium | 5.4 | 1% | 2021 |
| CVE-2021-3313 | medium | 5.4 | 1% | 2021 |
| CVE-2021-29002 | medium | 5.4 | 1% | 2021 |
| CVE-2020-7937 | medium | 5.4 | 1% | 2020 |
| CVE-2017-1000482 | medium | 5.4 | 1% | 2018 |
| CVE-2016-4042 | medium | 5.3 | 1% | 2017 |
| CVE-2012-6661 | medium | 5 | 2% | 2014 |
| CVE-2012-5508 | medium | 5 | 2% | 2014 |
| CVE-2012-5506 | medium | 5 | 2% | 2014 |
| CVE-2012-5505 | medium | 5 | 1% | 2014 |
| CVE-2012-5503 | medium | 5 | 1% | 2014 |
| CVE-2012-5501 | medium | 5 | 1% | 2014 |
| CVE-2012-5499 | medium | 5 | 2% | 2014 |
| CVE-2012-5498 | medium | 5 | 3% | 2014 |
| CVE-2012-5497 | medium | 5 | 2% | 2014 |
| CVE-2012-5496 | medium | 5 | 2% | 2014 |
| CVE-2012-5495 | medium | 5 | 2% | 2014 |
| CVE-2012-5492 | medium | 5 | 1% | 2014 |
| CVE-2012-5488 | medium | 5 | 3% | 2014 |
| CVE-2013-7060 | medium | 5 | 1% | 2014 |
| CVE-2013-4196 | medium | 5 | 1% | 2014 |
| CVE-2011-4462 | medium | 5 | 2% | 2011 |
| CVE-2006-1711 | medium | 5 | 4% | 2006 |
| CVE-2016-7135 | medium | 4.9 | 3% | 2017 |
25 older / lower-severity CVEs not shown — see Plone's full record.
Is my Plone version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your Plone version → · Monitor Plone for new CVEs →
Plone vulnerabilities — frequently asked
How many known vulnerabilities does Plone have?
IsItPatched tracks 105 CVEs for Plone. 3 are critical-severity and 20 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Plone have any actively-exploited vulnerabilities?
None of Plone's tracked CVEs are currently in CISA's KEV catalog — but new ones can be added at any time, so keep your version current.
What is the most severe Plone vulnerability?
Among tracked issues, CVE-2021-33509 (CRITICAL, CVSS 9.9) ranks highest — a Incorrect permission assignment weakness.
Is Plone safe to use?
It depends on the version. The latest supported Plone release (6.2.0) clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: Plone security status · Plone end-of-life · actively-exploited CVEs. Always verify against Plone's advisories — see our disclaimer.