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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55248
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 20:18:27 UTC
Updated2026-08-28 22:16:50 UTC
Descriptionplone.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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

EPSS: 0.003190000 probability, percentile 0.242760000 (date 2026-08-30)

Problem Types: CWE-400 | CWE-400 CWE-400: Uncontrolled Resource Consumption

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H
3.1CNADECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Plone Plone.app.portlets affected < 5.0.8 Not specified
CNA Plone Plone.app.portlets affected >= 6.0.0, < 6.0.4 Not specified
CNA Plone Plone.app.portlets affected >= 7.0.0, < 7.0.2 Not specified

References

ReferenceSourceLinkTags
github.com/plone/plone.app.portlets/commit/09da52ef7b297daa8e0cfd2361e47... [email protected] github.com
github.com/plone/plone.app.portlets/commit/9f16b6fb10211916686c6c346ea17... [email protected] github.com
github.com/plone/plone.app.portlets/commit/df5e256baee55083cbd6b9a262367... [email protected] github.com
github.com/plone/plone.app.portlets/security/advisories/GHSA-x5g3-w747-2h8q [email protected] github.com
github.com/plone/plone.app.portlets/commit/a3b2c2887165b308cd915cbb87b82... [email protected] github.com
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