PYSEC-2026-3884
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/plone-app-portlets/PYSEC-2026-3884.yaml
- JSON Data
- https://api.osv.dev/v1/vulns/PYSEC-2026-3884
- Aliases
- Published
- 2026-09-10T09:44:58Z
- Modified
- 2026-09-10T12:15:18Z
- Severity
-
- 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H CVSS Calculator
- Summary
- plone.app.portlets vulnerable to denial of service via RSS feed portlet
- Details
-
Impact
By adding an RSS portlet, and giving this a link to a very large file, a member can cause a denial of service attack, because Plone will use lots of memory. The member could also use different urls to try to get information about the internal network and open port numbers (SSRF). A malicious RSS feed could cause stored XSS, when the url of a feed item is a javascript url.
Patches
The problem has been patched in
plone.app.portlets.- For Plone 6.2: upgrade to
plone.app.portlets7.0.2 - For Plone 6.1: upgrade to
plone.app.portlets6.0.4 - For Plone 6.0: upgrade to
plone.app.portlets5.0.8
Workarounds
If upgrading is not immediately possible:
- Restrict who can manage portlets: remove the
plone.app.portlets.ManageOwnPortletspermission from untrusted roles, and limit Manage portlets to trusted administrators (usually this is already restricted to the Manager and Site Administrator roles). - Where the RSS portlet is not needed, unregister it so it cannot be added. This would need to be done by editing a
portlets.xmlin your own code, so it is not a quick fix.
References
This is similar to this
plone.app.eventvulnerability. It was discovered by the Plone Security Team by thinking of similar cases to theplone.app.eventproblem. - For Plone 6.2: upgrade to
- References
-
- https://github.com/plone/plone.app.portlets/security/advisories/GHSA-x5g3-w747-2h8q
- https://github.com/plone/plone.app.portlets/commit/09da52ef7b297daa8e0cfd2361e47c37d9b073ad
- https://github.com/plone/plone.app.portlets/commit/9f16b6fb10211916686c6c346ea174bf517e3fbd
- https://github.com/plone/plone.app.portlets/commit/a3b2c2887165b308cd915cbb87b8276f90a76680
- https://github.com/plone/plone.app.portlets/commit/df5e256baee55083cbd6b9a2623675d4cb26b6cd
- https://github.com/plone/plone.app.portlets
- https://pypi.org/project/plone-app-portlets
- https://github.com/advisories/GHSA-x5g3-w747-2h8q
- https://nvd.nist.gov/vuln/detail/CVE-2026-55248
Affected packages
PyPI / plone-app-portlets
Package
- Name
- plone-app-portlets
- View open source insights on deps.dev
- Purl
- pkg:pypi/plone-app-portlets
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affectedFixed5.0.8Introduced6.0.0Fixed6.0.4Introduced7.0.0Fixed7.0.2
Affected versions
1.*
1.0b1.1
1.0a2
1.0b1
1.0b2
1.0b3
1.0rc1
1.0rc2
1.0
1.0.1
1.0.1.1
1.0.2
1.0.3
1.0.5
1.0.6
1.1.0a1
1.1rc1
1.1.0
1.1.2
1.1.3
1.1.5
1.1.5.1
1.1.6
1.2b1
1.2rc1
1.2rc3
1.2
1.2.1
2.*
2.0a1
2.0a2
2.0a3
2.0a4
2.0b1
2.0b2
2.0b3
2.0b4
2.0b5
2.0b6
2.0b7
2.0b8
2.0b9
2.0b10
2.0b11
2.0
2.0.1
2.0.2
2.0.3
2.0.4
2.1.0
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
2.1.7
2.1.8
2.2
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
2.3a1
2.3
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6
2.3.7
2.3.8
2.3.9
2.4.0
2.4.1
2.4.2
2.4.3
2.4.4
2.4.5
2.4.6
2.4.7
2.4.8
2.5a1
2.5.0
2.5.1
2.5.2
2.5.3
2.5.4
2.5.5
2.5.6
2.5.7
3.*
3.0
3.0.1
3.0.2
3.0.3
3.0.4
3.0.5
3.0.6
3.0.7
3.0.8
3.0.9
3.0.10
3.1
3.1.1
3.1.2
3.1.3
3.1.4
3.1.5
3.1.6
4.*
4.0.0
4.1.0
4.1.1
4.1.2
4.2
4.2.1
4.2.2
4.2.3
4.3.0
4.3.1
4.3.2
4.3.3
4.3.4
4.4.0
4.4.1
4.4.2
4.4.3
4.4.4
4.4.5
4.4.6
4.4.7
4.4.8
4.4.9
5.*
5.0.0a1
5.0.0a2
5.0.0a3
5.0.0a4
5.0.0a5
5.0.0a6
5.0.0a7
5.0.0a8
5.0.0a9
5.0.0a10
5.0.0b1
5.0.0b2
5.0.0
5.0.1
5.0.2
5.0.3
5.0.4
5.0.5
5.0.6
5.0.7
6.*
6.0.0
6.0.1
6.0.2
6.0.3
7.*
7.0.0
7.0.1