CVE-2023-22487Network attack vector

Restricted-post disclosure via unchecked mentions

Published Jan 11, 2023 · Updated Mar 10, 2025

Improper access control in Flarum before 1.6.3 allows remote authenticated users to read restricted forum posts through mentions. The mentions extension adds mentioned posts to create and update API responses and resolves post IDs for rendered links without checking actor visibility. Permission to create a post, including one awaiting approval, is sufficient to disclose post content and correlate posts with otherwise inaccessible discussions.

CVSS severity7.7
High
EPSS probability0.66%
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 Flarum before 1.6.3 allows remote authenticated users to read restricted forum posts through mentions. The mentions extension adds mentioned posts to create and update API responses and resolves post IDs for rendered links without checking actor visibility. Permission to create a post, including one awaiting approval, is sufficient to disclose post content and correlate posts with otherwise inaccessible discussions.

The record

CVE
CVE-2023-22487
Published
Jan 11, 2023
Updated
Mar 10, 2025
Vendor
Flarum
Product
Flarum
Classifications
CWE-284, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 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=< 1.6.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Flarum · Flarumversion=< 1.6.3

Published CVSS scores

7.7GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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 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-284Improper Access Control
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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