CVE-2026-53674Network attack vector

Authenticated disclosure and service interruption via REGEXP injection

Published Jun 9, 2026 · Updated Jun 9, 2026

Regular expression injection in BuddyPress 14.4.0 and earlier allows remote authenticated users to disclose usernames or interrupt service. The activity mention resolver passes regex metacharacters through esc_sql and inserts them into an unprepared REGEXP query against the users table. The flaw is reachable only when username compatibility mode is enabled; crafted mentions permit boolean username inference or a database-query hang through catastrophic backtracking.

CVSS severity7.1
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Regular expression injection in BuddyPress 14.4.0 and earlier allows remote authenticated users to disclose usernames or interrupt service. The activity mention resolver passes regex metacharacters through esc_sql and inserts them into an unprepared REGEXP query against the users table. The flaw is reachable only when username compatibility mode is enabled; crafted mentions permit boolean username inference or a database-query hang through catastrophic backtracking.

The record

CVE
CVE-2026-53674
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
BuddyPress
Product
BuddyPress
Classifications
CWE-943, T1499.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 2026Record 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 <=14.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

BuddyPress · BuddyPressversion=0 <=14.4.0

Published CVSS scores

7.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
7.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H

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-943Improper Neutralization of Special Elements in Data Query Logic
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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