CVE-2024-47772

Cross-site Scripting (XSS) via chat excerpts when content security policy (CSP) disabled in Discourse

MEDIUM

6.1

CVSS Score

Published: October 7, 2024 at 08:50 PM UTC

Updated: June 17, 2026 at 07:57 AM UTC

1 product affected across 1 vendorDiscourse

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Severity

MEDIUM6.1

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

Discourse is an open source platform for community discussion. An attacker can execute arbitrary JavaScript on users' browsers by sending a maliciously crafted chat message and replying to it. This issue only affects sites with CSP disabled. This problem is patched in the latest version of Discourse. All users are advised to upgrade. Users unable to upgrade should ensure CSP is enabled on the forum. Users who do upgrade should also consider enabling a CSP as well as a proactive measure.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Discourse · Discourse

95%

v < 3.3.2v < 3.4.0v < 3.4.0.beta2v < 3.4.0_beta23.4.0 beta1

Affected range stops below 3.3.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.4.0, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.4.0.beta2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCMitigationThird Party Advisory

Source: [email protected]

https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP

x_refsource_CONFIRMVendor Advisory

Source: [email protected]

https://github.com/discourse/discourse/security/advisories/GHSA-67mh-xhmf-c56h

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: CHANGED
Confidentiality: LOW
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-79

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