RSS Aggregator – RSS Import, News Feeds, Feed to Post, and Autoblogging <= 5.0.11 - Unauthenticated DOM-Based Reflected Cross-Site Scripting via postMessage

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Summary

CVECVE-2026-2433
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-07 08:16:11 UTC
Updated2026-04-22 21:27:27 UTC
DescriptionThe RSS Aggregator – RSS Import, News Feeds, Feed to Post, and Autoblogging plugin for WordPress is vulnerable to DOM-Based Cross-Site Scripting via postMessage in all versions up to, and including, 5.0.11. This is due to the plugin's admin-shell.js registering a global message event listener without origin validation (missing event.origin check) and directly passing user-controlled URLs to window.open() without URL scheme validation. This makes it possible for unauthenticated attackers to execute arbitrary JavaScript in the context of an authenticated administrator's session by tricking them into visiting a malicious website that sends crafted postMessage payloads to the plugin's admin page.

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from [email protected]

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

EPSS: 0.000610000 probability, percentile 0.191180000 (date 2026-04-22)

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Rebelcode RSS Aggregator RSS Import News Feeds Feed To Post And Autoblogging affected 5.0.11 semver Not specified

References

ReferenceSourceLinkTags
www.wordfence.com/threat-intel/vulnerabilities/id/311960e7-c4b4-4638-980f-1e08f... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/wp-rss-aggregator/trunk/core/js/admin-shell.js [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wp-rss-aggregator/tags/5.0.10/core/js/admin-shell.js [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wp-rss-aggregator/trunk/core/js/admin-shell.js [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wp-rss-aggregator/tags/5.0.10/core/js/admin-shell.js [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Osvaldo Noe Gonzalez Del Rio (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-02-12T22:05:34.000ZVendor Notified
CNA2026-03-06T19:00:27.000ZDisclosed
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