CVE-2026-33514Network attack vector

Authenticated metadata disclosure via unscoped template queries

Published May 19, 2026 · Updated May 19, 2026

Missing authorization in Discourse form-template endpoints allows remote authenticated users to read restricted template metadata. The index action queries all templates and the show action performs an unrestricted ID lookup, so neither filters results through accessible categories. Exploitation requires an authenticated account and enabled form templates; exposure is limited to template names, YAML bodies, and site configuration metadata.

CVSS severity6.0
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Discourse form-template endpoints allows remote authenticated users to read restricted template metadata. The index action queries all templates and the show action performs an unrestricted ID lookup, so neither filters results through accessible categories. Exploitation requires an authenticated account and enabled form templates; exposure is limited to template names, YAML bodies, and site configuration metadata.

The record

CVE
CVE-2026-33514
Published
May 19, 2026
Updated
May 19, 2026
Vendor
Discourse
Product
Discourse
Classifications
CWE-862, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 19, 2026CVE publishedPublication date reported by the CVE source.
  2. May 19, 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=< 2026.1.4
  2. Affected versionversion=>= 2026.3.0-latest, < 2026.3.1
  3. Affected versionversion=>= 2026.4.0-latest, < 2026.4.1
  4. Affected versionversion=>= 2026.5.0-latest , < 2026.5.0-latest.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Discourse · Discourseversion=< 2026.1.4; version=>= 2026.3.0-latest, < 2026.3.1; version=>= 2026.4.0-latest, < 2026.4.1; version=>= 2026.5.0-latest , < 2026.5.0-latest.1

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
6.0GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1213Data from Information Repositories

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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