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PatchSiren cyber security CVE debrief

CVE-2026-53674 BuddyPress CVE debrief

CVE-2026-53674 is a HIGH severity vulnerability in BuddyPress 14.4.0. The vulnerability exists in the activity mention resolver when username compatibility mode is enabled. Attackers can craft @mentions containing regex metacharacters, which pass through esc_sql unescaped and are inserted into an unprepared REGEXP query against the users table. This allows for boolean-based inference of usernames and denial of service through catastrophic backtracking. The CVSS score for this vulnerability is 7.1.

Vendor
BuddyPress
Product
BuddyPress 14.4.0
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-10
Advisory published
2026-06-10
Advisory updated
2026-06-10

Who should care

Users of BuddyPress 14.4.0, particularly those with username compatibility mode enabled, should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability is caused by the activity mention resolver's failure to properly sanitize @mentions containing regex metacharacters. When username compatibility mode is enabled, these metacharacters are not escaped and are inserted into a REGEXP query against the users table. This allows attackers to manipulate the REGEXP database clause and potentially extract sensitive information or cause denial of service.

Defensive priority

HIGH

Recommended defensive actions

  • Update to a patched version of BuddyPress as soon as possible.
  • Disable username compatibility mode if not required.
  • Implement additional security measures to monitor and restrict activity mentions.

Evidence notes

The CVE record [cve-org] and NVD detail [nvd] provide official information about the vulnerability. Additional information can be found in the source references [ref-4], [ref-5], and [ref-6].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-53674 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-53674

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-53674 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-53674

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.