CVE-2026-50571

WebSub is a W3C recommendation produced by the Social Web Working Group. In recommendation REC-websub-20180123, the intent-verification protocol requires a subscriber to echo the hub.challenge value, also exposed as hubchallenge by some frameworks, but does not require safe response media typing ...

CVE-2026-50571 WebSub: Reflected script execution through intent-verification challenges

WebSub is a W3C recommendation produced by the Social Web Working Group. In recommendation REC-websub-20180123, the intent-verification protocol requires a subscriber to echo the hub.challenge value, also exposed as hubchallenge by some frameworks, but does not require safe response media typing ...

EUVD-2026-111412

WebSub is a W3C recommendation produced by the Social Web Working Group. In recommendation REC-websub-20180123, the intent-verification protocol requires a subscriber to echo the hub.challenge value, also exposed as hubchallenge by some frameworks, but does not require safe response media typing ...

CVE-2026-50571

The WebSub protocol (REC-websub-20180123) is vulnerable to reflected script execution because the intent-verification protocol requires echoing the hub.challenge value without requiring safe response media typing or disabled MIME sniffing. An attacker can redirect a victim to a crafted verificati...

CVE-2026-50571 WebSub: Reflected script execution through intent-verification challenges

WebSub is a W3C recommendation produced by the Social Web Working Group. In recommendation REC-websub-20180123, the intent-verification protocol requires a subscriber to echo the hub.challenge value, also exposed as hubchallenge by some frameworks, but does not require safe response media typing ...

CVE-2026-50571 WebSub: Reflected script execution through intent-verification challenges

WebSub is a W3C recommendation produced by the Social Web Working Group. In recommendation REC-websub-20180123, the intent-verification protocol requires a subscriber to echo the hub.challenge value, also exposed as hubchallenge by some frameworks, but does not require safe response media typing ...

CVE-2026-50571: w3c websub: WebSub is a W3C recommendation produced by the Social Web Working Group

WebSub is a W3C recommendation produced by the Social Web Working Group. In recommendation REC-websub-20180123, the intent-verification protocol requires a subscriber to echo the hub.challenge value, also exposed as hubchallenge by some frameworks, but does not require safe response media typing ...

World Wide Web Consortium WebSub cross-site scripting vulnerability

The World Wide Web Consortium’s WebSub REC-WebSub-20180123 version contains a cross-site scripting vulnerability. This flaw arises because the intent-verification protocol fails to mandate secure response media types or disables MIME sniffing. Attackers can craft validation requests containing HT...

CVE-2026-73474

Server-Side Request Forgery SSRF vulnerability in Drupal Entity Share Websub allows Server Side Request Forgery. This issue affects Entity Share Websub versions: from 0.0.0 to 1.1.2...

CVE-2026-73474 Entity Share Websub - Moderately critical - Server-side request forgery (SSRF) - SA-CONTRIB-2026-097

Server-Side Request Forgery SSRF vulnerability in Drupal Entity Share Websub allows Server Side Request Forgery. This issue affects Entity Share Websub versions: from 0.0.0 to 1.1.2...

EUVD-2026-69991

Server-Side Request Forgery SSRF vulnerability in Drupal Entity Share Websub allows Server Side Request Forgery. This issue affects Entity Share Websub versions: from 0.0.0 to 1.1.2...

CVE-2026-73474

Server-Side Request Forgery SSRF vulnerability in Drupal Entity Share Websub allows Server Side Request Forgery. This issue affects Entity Share Websub versions: from 0.0.0 to 1.1.2...

CVE-2026-73474

The Drupal Entity Share Websub module (versions 0.0.0 through 1.1.2 ) is vulnerable to a Server-Side Request Forgery (SSRF) . The root cause is the insufficient validation of certain inputs , which allows an attacker to coerce the server into making unauthorized requests to internal or external r...

CVE-2026-73474 Entity Share Websub - Moderately critical - Server-side request forgery (SSRF) - SA-CONTRIB-2026-097

Server-Side Request Forgery SSRF vulnerability in Drupal Entity Share Websub allows Server Side Request Forgery. This issue affects Entity Share Websub versions: from 0.0.0 to 1.1.2...

CVE-2026-73474: Server-Side Request Forgery (SSRF)

Server-Side Request Forgery SSRF vulnerability in Drupal Entity Share Websub allows Server Side Request Forgery. This issue affects Entity Share Websub versions: from 0.0.0 to 1.1.2...

Entity Share Websub - Moderately critical - Server-side request forgery (SSRF) - SA-CONTRIB-2026-097

This module enables you to share content between sites in a hub - subscriber model. Certain inputs were not sufficiently validated, allowing an attacker to achieve server-side request forgery attacks...

WordPress WebSub (FKA. PubSubHubbub) plugin <= 3.1.4 - Authenticated (Admin+) Stored Cross-Site Scripting vulnerability

Authenticated Admin+ Stored Cross-Site Scripting vulnerability discovered by Sh in WordPress Plugin WebSub versions = 3.1.4...

CVE-2024-0688

The "WebSub FKA. PubSubHubbub" plugin for WordPress is vulnerable to Stored Cross-Site Scripting via plugin settings in all versions up to, and including, 3.1.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level...

Cross site scripting

The "WebSub FKA. PubSubHubbub" plugin for WordPress is vulnerable to Stored Cross-Site Scripting via plugin settings in all versions up to, and including, 3.1.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level...

CVE-2024-0688

The CVE-2024-0688 entry concerns the WebSub (PubSubHubbub) WordPress plugin. Affected versions: all up to and including 3.1.4. Root cause: insufficient input sanitization and output escaping in plugin settings, enabling Stored Cross-Site Scripting. Impact: authenticated attackers with administrat...