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High

Discourse: Chat MessageBus delivers read-restricted messages to unauthorized users

Type: advisorySource: Official CVE ListRisk context updated1 source record

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, the video placeholder component allowed crafted HTML to cause an attribute breakout and inject an attacker-controlled event handler. An authenticated user with default trust-level posting privileges could store the crafted placeholder in a post. When another user opened the post and clicked the video play overlay, the handler could execute arbitrary JavaScript in the viewer's session. Default Content Security Policy settings block inline event handlers, but instances with CSP disabled or relaxed could allow the script to read page content and make authenticated requests as the viewer. This issue is fixed in versions 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0.

Announced Source revision 2
Original source ↗
CVE context updated. The publisher announcement is unchanged.

CVE-2026-91122

Primary source · Revision 2

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-91122

discourse

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "discourse",
    "product": "discourse",
    "versions": [
      {
        "status": "affected",
        "version": "< 2026.8.0"
      },
      {
        "status": "affected",
        "version": ">= 2026.7.0-latest, < 2026.7.2"
      },
      {
        "status": "affected",
        "version": ">= 2026.6.0-latest, < 2026.6.3"
      },
      {
        "status": "affected",
        "version": ">= 2026.1.0-latest, < 2026.1.8"
      }
    ]
  }
]
Related CVEs
CVE-2026-91122

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-91122 · High

discourse

Event
#59642 · Revision 2
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Publisher date
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