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CVE-2026-55248

plone.app.portlets: Denial of service via RSS feed portlet PUBLISHED

Description (CNA)

plone.app.portlets provides portlets and a Plone-specific user interface for plone.portlets. Prior to 5.0.8, 6.0.4, and 7.0.2, a member who can add an RSS portlet can set its feed URL to a very large response, causing src/plone/app/portlets/portlets/rss.py to download and retain excessive data in memory and deny service. The same RSS URL handling accepts internal hosts, IP addresses, single-word domains, and explicit ports, allowing server-side requests that can probe internal network services and open ports. A malicious feed item can also supply a JavaScript URL that is retained as the item link and can execute script when used by a victim. The affected logic includes _rss_feed_url_validator, _normal_url_validator, RSSFeed._retrieveFeed, RSSFeed._buildItemDict, and the FEED_DATA in-memory cache. This issue is fixed in versions 5.0.8, 6.0.4, and 7.0.2.

Affected (CNA)

Vendor / productVersions
plone / plone.app.portletsaffected < 5.0.8; affected >= 6.0.0, < 6.0.4; affected >= 7.0.0, < 7.0.2

CWE

CWE-400

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.