CVE-2026-33251Network attack vector

Authenticated solution-status changes via hidden-topic bypass

Published Mar 20, 2026 · Updated Mar 20, 2026

Authorization bypass in Discourse before 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 allows remote authenticated users to alter Solved status. Discourse has not published the affected endpoint or the exact authorization check omitted when accepting or unaccepting a solution on a hidden topic. Exploitation requires a logged-in account in an allowed group and permits changing which reply is marked as the accepted solution, without reported availability impact.

CVSS severity5.4
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Discourse before 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 allows remote authenticated users to alter Solved status. Discourse has not published the affected endpoint or the exact authorization check omitted when accepting or unaccepting a solution on a hidden topic. Exploitation requires a logged-in account in an allowed group and permits changing which reply is marked as the accepted solution, without reported availability impact.

The record

CVE
CVE-2026-33251
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
Discourse
Product
Discourse
Classifications
CWE-863, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 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=>= 2026.1.0-latest, < 2026.1.2
  2. Affected versionversion=>= 2026.2.0-latest, < 2026.2.1
  3. Affected versionversion== 2026.3.0-latest

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Discourse · Discourseversion=>= 2026.1.0-latest, < 2026.1.2; version=>= 2026.2.0-latest, < 2026.2.1; version== 2026.3.0-latest

Published CVSS scores

5.4GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A: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-863Incorrect Authorization
T1565.001Stored Data Manipulation

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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