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CVE-2026-55248— plone.app.portlets: Denial of service via RSS feed portlet

Quick assessment

Affected
plone plone.app.portlets
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

plone.app.portlets 提供了端口小部件（portlets）以及用于 plone.portlets 的 Plone 专用用户界面。在 5.0.8、6.0.4 和 7.0.2 之前的版本中，任何能够添加 RSS 小部件的用户都可以将其 RSS 源 URL 设置为一个会返回超大响应的地址，导致 下载并在内存中保留过多数据，从而造成服务拒绝（DoS）。相同的 RSS URL 处理逻辑还接受内网主机、IP 地址、单字域名以及显式端口，允许发起服务器端请求，可用于探测内网服务和开放端口。此外，恶意的 feed

CVSS 9.1 · Critical

Possible ATT&CK Techniques 1 AI

T1090 · Proxy

Affected Version Matrix 3

VendorProduct Version RangeStatus
plone plone.app.portlets < 5.0.8 affected
>= 6.0.0, < 6.0.4 affected
>= 7.0.0, < 7.0.2 affected
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I. Basic Information for CVE-2026-55248

Vulnerability Information
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Vulnerability Title
plone.app.portlets: Denial of service via RSS feed portlet
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
plone plone.app.portlets < 5.0.8 -

II. Public POCs for CVE-2026-55248

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III. Intelligence Information for CVE-2026-55248

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Patches & Fixes for CVE-2026-55248 (4)

Vendor Advisories for CVE-2026-55248 (1)

IV. Related Vulnerabilities

Same vendor: plone
Same weakness: CWE-400

V. Comments for CVE-2026-55248

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