CVE-2023-49099Network attack vector

Secure upload disclosure via missing guest rejection

Published Jan 12, 2024 · Updated Jun 17, 2025

Improper access control in Discourse before 3.1.4 and 3.2.0.beta1 through 3.2.0.beta3 allows remote attackers to read secure uploads. UploadsController's handle_secure_upload_request checks post visibility but fails to reject guests when login_required is enabled. Exploitation requires a post-associated secure upload URL and user interaction; exposure is limited to the referenced upload.

CVSS severity3.1
Low
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Discourse before 3.1.4 and 3.2.0.beta1 through 3.2.0.beta3 allows remote attackers to read secure uploads. UploadsController's handle_secure_upload_request checks post visibility but fails to reject guests when login_required is enabled. Exploitation requires a post-associated secure upload URL and user interaction; exposure is limited to the referenced upload.

The record

CVE
CVE-2023-49099
Published
Jan 12, 2024
Updated
Jun 17, 2025
Vendor
Discourse
Product
Discourse
Classifications
CWE-284, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 2025Record 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=< 3.1.4
  2. Affected versionversion=>= 3.2.0beta1, < 3.2.0.beta4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Discourse · Discourseversion=< 3.1.4; version=>= 3.2.0beta1, < 3.2.0.beta4

Published CVSS scores

3.1GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
4.3NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1190Exploit Public-Facing Application

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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