CVE-2023-37904Network attack vector

Excess account creation via unlocked invite redemption

Published Jul 28, 2023 · Updated Oct 10, 2024

Race condition in Discourse stable before 3.0.6 and beta 3.1.0.beta1 through 3.1.0.beta6 allows remote attackers to exceed invite limits. InviteRedeemer created an invited-user record and incremented redemption_count without locking the invite row, so concurrent accept requests could each pass the redemption limit. Exploitation requires a valid invite link and precisely timed concurrent requests; the bounded consequence is creation of additional forum accounts.

CVSS severity2.6
Low
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Discourse stable before 3.0.6 and beta 3.1.0.beta1 through 3.1.0.beta6 allows remote attackers to exceed invite limits. InviteRedeemer created an invited-user record and incremented redemption_count without locking the invite row, so concurrent accept requests could each pass the redemption limit. Exploitation requires a valid invite link and precisely timed concurrent requests; the bounded consequence is creation of additional forum accounts.

The record

CVE
CVE-2023-37904
Published
Jul 28, 2023
Updated
Oct 10, 2024
Vendor
Discourse
Product
Discourse
Classifications
CWE-362, T1136
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 10, 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=< 3.0.6
  2. Affected versionversion=>= 3.1.0.beta1, < 3.1.0.beta7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Discourse · Discourseversion=< 3.0.6; version=>= 3.1.0.beta1, < 3.1.0.beta7

Published CVSS scores

2.6GitHub CNACVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
3.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:R/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1136Create Account

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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