Skip to main content

Discourse CVE-2026-72727

| EUVDEUVD-2026-55666 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-08-10 GitHub_M
XSS Discourse
4.8
CVSS 4.0 · Vendor: GitHub_M
Share

Severity by source

Vendor (GitHub_M) PRIMARY
4.8 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
5.4 MEDIUM

Low-privileged account required (PR:L); moderator must actively view queue (UI:R); XSS fires in moderator session representing a scope change from submitter to privileged user (S:C).

3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:P/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
A
Scope
X

Lifecycle Timeline

3
Patch available
Aug 10, 2026 - 17:03 EUVD
Analysis Generated
Aug 10, 2026 - 16:53 vuln.today
CVE Published
Aug 10, 2026 - 16:08 cve.org
MEDIUM 4.8

DescriptionCVE.org

Discourse is an open-source discussion platform. Prior to 026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, a low-privileged user could place crafted content in the moderation review queue that executed stored cross-site scripting when a moderator viewed it on a site with a modified or disabled default Content Security Policy. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

AnalysisAI

Stored cross-site scripting in Discourse's moderation review queue allows a low-privileged registered user to execute arbitrary JavaScript in a moderator's browser session. All Discourse deployments running versions prior to 2026.1.6, 2026.5.2, 2026.6.1, or 2026.7.0 are affected, but only when the platform's default Content Security Policy has been modified or disabled. …

Unlock full vulnerability intelligence

  • Risk assessment & exploitation conditions
  • Attack chain visualization
  • Remediation with exact patch versions
  • Threat intelligence from 22 sources
  • Personal watchlist & email alerts
Continue with Google Continue with GitHub

Free forever · No credit card required

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
technique details hidden
Delivery
technique details hidden
Exploit
technique details hidden
Execution
technique details hidden
Persist
technique details hidden
Impact
technique details hidden
Sign in to reveal

Vulnerability AssessmentAI

Exploitation Three concrete prerequisites must all be true simultaneously. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 4.8 (Medium) accurately reflects a constrained-but-real risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade Discourse to the patched release applicable to the deployed branch: 2026.1.6, 2026.5.2, 2026.6.1, or 2026.7.0. … Detailed patch versions, workarounds, and compensating controls in full report.
Sign in to read full assessment

Threat intelligence, references, and detailed analysis are available after sign-in.

More in Discourse

View all
CVE-2025-48954 HIGH POC
8.1 Jun 25

Discourse versions prior to 3.5.0.beta6 contain a reflected cross-site scripting (XSS) vulnerability in social login fun
CVE-2024-47773 HIGH POC
8.2 Oct 08

Discourse is an open source platform for community discussion. Rated high severity (CVSS 8.2), this vulnerability is rem
CVE-2021-3138 HIGH POC
7.5 Jan 14

In Discourse 2.7.0 through beta1, a rate-limit bypass leads to a bypass of the 2FA requirement for certain forms. Rated

CVE-2023-38706 MEDIUM POC
6.5 Sep 15

Discourse is an open-source discussion platform. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploi
CVE-2024-53991 MEDIUM POC
5.9 Dec 19

Discourse is an open source platform for community discussion. Rated medium severity (CVSS 5.9), this vulnerability is r
CVE-2025-48877 CRITICAL
9.8 Jun 09

Discourse versions prior to 3.4.4 (stable), 3.5.0.beta5 (beta), and 3.5.0.beta6-dev (tests-passed) contain a critical vu
CVE-2023-47121 CRITICAL
9.8 Nov 10

Discourse is an open source platform for community discussion. Rated critical severity (CVSS 9.8), this vulnerability is
CVE-2021-41163 CRITICAL
9.8 Oct 20

Discourse is an open source platform for community discussion. Rated critical severity (CVSS 9.8), this vulnerability is
CVE-2024-49765 CRITICAL
9.1 Dec 19

Discourse is an open source platform for community discussion. Rated critical severity (CVSS 9.1), this vulnerability is
CVE-2026-53963 CRITICAL
9.0 Jul 09

Stored cross-site scripting in the Discourse discussion platform allows a low-privileged registered user to set a malici
CVE-2022-39356 HIGH
8.8 Nov 02

Discourse is a platform for community discussion. Rated high severity (CVSS 8.8), this vulnerability is remotely exploit
CVE-2026-27934 HIGH
8.7 Mar 19

Unauthorized information disclosure in Discourse discussion platform versions prior to 2026.3.0-latest.1, 2026.2.1, and

Same weakness CWE-79 – Cross-site Scripting (XSS)

View all
CVE-2020-3580 MEDIUM POC
6.1
CVE-2013-7389 MEDIUM POC
4.3
CVE-2021-25299 MEDIUM POC
6.1
CVE-2014-2120 MEDIUM
6.1
CVE-2023-40000 HIGH POC
8.3
CVE-2016-8581 MEDIUM POC
6.1
CVE-2013-5223 MEDIUM POC
5.4
CVE-2025-52367 MEDIUM POC
5.4

Same technique XSS

View all
CVE-2017-9248 CRITICAL POC
9.8
CVE-2020-3580 MEDIUM POC
6.1
CVE-2013-1710 CRITICAL POC
10.0
CVE-2013-7389 MEDIUM POC
4.3
CVE-2021-25299 MEDIUM POC
6.1
CVE-2014-2120 MEDIUM
6.1
CVE-2023-40000 HIGH POC
8.3
CVE-2024-52875 HIGH POC
8.8

Share

CVE-2026-72727 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy