CVE-2024-53991Network attack vector

Backup disclosure via crafted nginx request

Published Dec 19, 2024 · Updated Dec 20, 2024

Information disclosure in Discourse stable 3.3.2 and earlier allows remote attackers to download local backups through nginx. A crafted URL makes nginx resolve a known backup filename under FileStore::LocalStore and return the file outside the normal application download path. Exposure requires local backup storage and knowledge of a filename; beta and tests-passed 3.4.0.beta3 and earlier are also affected, with no reported write or service-interruption impact.

CVSS severity7.5
High
EPSS probability26.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Discourse stable 3.3.2 and earlier allows remote attackers to download local backups through nginx. A crafted URL makes nginx resolve a known backup filename under FileStore::LocalStore and return the file outside the normal application download path. Exposure requires local backup storage and knowledge of a filename; beta and tests-passed 3.4.0.beta3 and earlier are also affected, with no reported write or service-interruption impact.

The record

CVE
CVE-2024-53991
Published
Dec 19, 2024
Updated
Dec 20, 2024
Vendor
Discourse
Product
Discourse
Classifications
CWE-200, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 19, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 20, 2024Record 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=beta: <= 3.4.0.beta3
  2. Affected versionversion=stable: <= 3.3.2
  3. Affected versionversion=tests-passed: <= 3.4.0.beta3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Discourse · Discourseversion=beta: <= 3.4.0.beta3; version=stable: <= 3.3.2; version=tests-passed: <= 3.4.0.beta3

Published CVSS scores

5.9NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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-200Exposure of Sensitive Information to an Unauthorized Actor
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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