{"cve":"CVE-2026-55248","nvd":{"published":"2026-08-28T20:18:27.030","modified":"2026-09-09T21:09:13.080","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H","score":9.1},"cwes":["CWE-400"],"references":["https://github.com/plone/plone.app.portlets/commit/09da52ef7b297daa8e0cfd2361e47c37d9b073ad","https://github.com/plone/plone.app.portlets/commit/9f16b6fb10211916686c6c346ea174bf517e3fbd","https://github.com/plone/plone.app.portlets/commit/a3b2c2887165b308cd915cbb87b8276f90a76680","https://github.com/plone/plone.app.portlets/commit/df5e256baee55083cbd6b9a2623675d4cb26b6cd","https://github.com/plone/plone.app.portlets/security/advisories/GHSA-x5g3-w747-2h8q"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:50.842544443+00:00"},"epss":{"cve":"CVE-2026-55248","score":0.00441,"percentile":0.38316,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-x5g3-w747-2h8q","url":"https://osv.dev/vulnerability/GHSA-x5g3-w747-2h8q","summary":"plone.app.portlets vulnerable to denial of service via RSS feed portlet","modified":"2026-09-10T12:25:27.212176003Z","packages":[{"ecosystem":"PyPI","name":"plone-app-portlets","purl":"pkg:pypi/plone-app-portlets","ranges":[">=7.0.0 <7.0.2"],"fixed":["7.0.2"]},{"ecosystem":"PyPI","name":"plone-app-portlets","purl":"pkg:pypi/plone-app-portlets","ranges":[">=6.0.0 <6.0.4"],"fixed":["6.0.4"]},{"ecosystem":"PyPI","name":"plone-app-portlets","purl":"pkg:pypi/plone-app-portlets","ranges":["<5.0.8"],"fixed":["5.0.8"]}]},{"id":"PYSEC-2026-3884","url":"https://osv.dev/vulnerability/PYSEC-2026-3884","summary":"plone.app.portlets vulnerable to denial of service via RSS feed portlet","modified":"2026-09-10T12:15:18.815538542Z","packages":[{"ecosystem":"PyPI","name":"plone-app-portlets","purl":"pkg:pypi/plone-app-portlets","ranges":["<5.0.8",">=6.0.0 <6.0.4",">=7.0.0 <7.0.2"],"fixed":["5.0.8","6.0.4","7.0.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}