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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是Plone组织的一个提供网页内容区块布局管理的插件模块。 plone.app.portlets 5.0.8之前版本、6.0.4之前版本和7.0.2之前版本存在资源管理错误漏洞，该漏洞源于对RSS feed URL验证不当，可添加RSS portlet的成员通过设置过大的feed URL导致src/plone/app/portlets/portlets/rss.py下载并保留过多数据在内存中造成拒绝服务，同时RSS URL处理接受内部主机、IP地址等导致服务端请求伪造，

CVSS 9.1 · Critical EPSS 0.44% · P37

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
Vulnerability Title
plone.app.portlets 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
plone.app.portlets是Plone组织的一个提供网页内容区块布局管理的插件模块。 plone.app.portlets 5.0.8之前版本、6.0.4之前版本和7.0.2之前版本存在资源管理错误漏洞，该漏洞源于对RSS feed URL验证不当，可添加RSS portlet的成员通过设置过大的feed URL导致src/plone/app/portlets/portlets/rss.py下载并保留过多数据在内存中造成拒绝服务，同时RSS URL处理接受内部主机、IP地址等导致服务端请求伪造，
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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 product: plone.app.portlets
Same vendor: plone
Same weakness: CWE-400

V. Comments for CVE-2026-55248

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