CVE-2026-72727Network attack vectorHinoki check available

Stored XSS via crafted moderation-queue content

Published Aug 10, 2026 · Updated Aug 10, 2026

Stored XSS in affected Discourse releases allows remote authenticated users to run script in a moderator's browser through queued content. The advisory does not identify the review-queue rendering locus or the missing neutralization operation that permits the stored payload to execute. Exploitation requires a moderator to view the queued item and a site whose default Content Security Policy is modified or disabled, exposing data and actions available to that moderator.

CVSS severity4.8
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in affected Discourse releases allows remote authenticated users to run script in a moderator's browser through queued content. The advisory does not identify the review-queue rendering locus or the missing neutralization operation that permits the stored payload to execute. Exploitation requires a moderator to view the queued item and a site whose default Content Security Policy is modified or disabled, exposing data and actions available to that moderator.

The record

CVE
CVE-2026-72727
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
Discourse
Product
Discourse
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2026.1.6
  2. Affected versionversion=>= 2026.5.0-latest, < 2026.5.2
  3. Affected versionversion=>= 2026.6.0-latest, < 2026.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Discourse · Discourseversion=< 2026.1.6; version=>= 2026.5.0-latest, < 2026.5.2; version=>= 2026.6.0-latest, < 2026.6.1

Published CVSS scores

4.8GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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