CVE-2024-23649Public exploitNetwork attack vector

Private-message disclosure via missing report authorization

Published Jan 24, 2024 · Updated May 30, 2025

Improper authorization in Lemmy 0.17.0 through 0.19.0 allows remote authenticated users to read arbitrary private messages. The /api/v3/private_message/report handler accepts any message ID without verifying that the reporter is its recipient, then returns the message in private_message_report_view. A valid account and a guessed message ID are required; each successful request exposes message contents and creates a visible report.

CVSS severity7.5
High
EPSS probability0.51%
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 Lemmy 0.17.0 through 0.19.0 allows remote authenticated users to read arbitrary private messages. The /api/v3/private_message/report handler accepts any message ID without verifying that the reporter is its recipient, then returns the message in private_message_report_view. A valid account and a guessed message ID are required; each successful request exposes message contents and creates a visible report.

The record

CVE
CVE-2024-23649
Published
Jan 24, 2024
Updated
May 30, 2025
Vendor
LemmyNet
Product
Lemmy
Classifications
CWE-285, CWE-200, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 24, 2024CVE publishedPublication date reported by the CVE source.
  2. May 30, 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=>= 0.17.0, < 0.19.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

LemmyNet · Lemmyversion=>= 0.17.0, < 0.19.1

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
6.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-285Improper Authorization
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1190Exploit Public-Facing Application

Public exploit references

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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