CVE-2026-55248Critical· 9.1▾ Midnightplone.app.portlets vulnerable to denial of service via RSS feed portlet
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 50.1 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 29.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
0.3%
Last analysed / modified upstream
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.
The problem has been patched in plone.app.portlets.
plone.app.portlets 7.0.2plone.app.portlets 6.0.4plone.app.portlets 5.0.8If upgrading is not immediately possible:
plone.app.portlets.ManageOwnPortlets permission from untrusted roles, and limit Manage portlets to trusted administrators (usually this is already restricted to the Manager and Site Administrator roles).portlets.xml in your own code, so it is not a quick fix.This is similar to this plone.app.event vulnerability. It was discovered by the Plone Security Team by thinking of similar cases to the plone.app.event problem.
plone-app-portlets >= 7.0.0, < 7.0.2plone-app-portlets >= 6.0.0, < 6.0.4plone-app-portlets < 5.0.8Upgrade to a patched release:
plone-app-portlets 7.0.2plone-app-portlets 6.0.4plone-app-portlets 5.0.8Connected by shared product, vendor, weakness, or advisory.
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