CVE-2026-53674
CVE-2026-53674 is a high-severity vulnerability with a CVSS 3.x base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-943.
Key facts
- Severity: High (CVSS 3.x base score 7.1)
- CVSS v4: 7.1
- EPSS exploit prediction: 0% (21st percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-35878
- Weakness: CWE-943
- Published:
- Last modified:
Description
BuddyPress 14.4.0 contains a regular expression injection vulnerability in the activity mention resolver that, when username compatibility mode is enabled, allows attackers to manipulate a REGEXP database clause by crafting mention names containing regex metacharacters. Attackers can submit @mentions whose metacharacters pass through esc_sql unescaped and are inserted into an unprepared REGEXP query against the users table, enabling boolean-based inference of usernames and denial of service through catastrophic backtracking.
Frequently asked questions
- What is CVE-2026-53674?
- BuddyPress 14.4.0 contains a regular expression injection vulnerability in the activity mention resolver that, when username compatibility mode is enabled, allows attackers to manipulate a REGEXP database clause by crafting mention names containing regex metacharacters. Attackers can submit @mentions whose metacharacters pass through esc_sql unescaped and are inserted into an unprepared REGEXP query against the users table, enabling boolean-based inference of usernames and denial of service through catastrophic backtracking.
- How severe is CVE-2026-53674?
- CVE-2026-53674 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.
- Is CVE-2026-53674 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-53674?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-53674 have an EU (EUVD) identifier?
- Yes. CVE-2026-53674 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35878.
- When was CVE-2026-53674 published?
- CVE-2026-53674 was published on 2026-06-10 and last updated on 2026-06-17.
References
- https://buddypress.org/
- https://wordpress.org/plugins/buddypress/
- https://www.vulncheck.com/advisories/buddypress-regexp-injection-via-mention-username-resolution
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