CVE-2026-33074Network attack vector

Higher-tier group access via client-controlled plan finalization

Published Mar 31, 2026 · Updated Mar 31, 2026

Improper authorization in Discourse before 2026.1.3, 2026.2.2, and 2026.3.0 allows remote authenticated users to gain higher-tier access. The subscriptions finalization endpoint trusts client-supplied plan and transaction values instead of binding them to the lower-tier purchase created earlier. Exploitation requires the plugin, Stripe, and a purchase entering the 3-D Secure incomplete-payment flow; the consequence is unauthorized Discourse group membership and its configured benefits.

CVSS severity6.3
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Discourse before 2026.1.3, 2026.2.2, and 2026.3.0 allows remote authenticated users to gain higher-tier access. The subscriptions finalization endpoint trusts client-supplied plan and transaction values instead of binding them to the lower-tier purchase created earlier. Exploitation requires the plugin, Stripe, and a purchase entering the 3-D Secure incomplete-payment flow; the consequence is unauthorized Discourse group membership and its configured benefits.

The record

CVE
CVE-2026-33074
Published
Mar 31, 2026
Updated
Mar 31, 2026
Vendor
Discourse
Product
Discourse
Classifications
CWE-285, CWE-269, T1098
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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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, < 2026.1.3
  2. Affected versionversion=>= 2026.2.0-latest, < 2026.2.2
  3. Affected versionversion=>= 2026.3.0-latest, < 2026.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Discourse · Discourseversion=>= 2026.1.0-latest, < 2026.1.3; version=>= 2026.2.0-latest, < 2026.2.2; version=>= 2026.3.0-latest, < 2026.3.0

Published CVSS scores

6.3GitHub, Inc.CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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-285Improper Authorization
CWE-269Improper Privilege Management
T1098Account 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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