Auth bypass in Buddypress
CVE-2026-53673
BuddyPress 14.4.0 contains an insecure direct object reference vulnerability in the messages REST API that allows authenticated attackers to access arbitrary private message threads by supplying a user_id parameter in the request. Attackers can pass another user's identifier to the get_item_permissions_check method, which validates the supplied user_id instead of the logged-in user and is reused by the update and delete handlers, to read, reply to, or delete any user's private messages.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (41.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Buddypress — versions 0
Weakness classification (CWE)
References
- buddypress.org/ (product)
- wordpress.org/plugins/buddypress/ (product)
- www.vulncheck.com/advisories/buddypress-private-message-idor-via-rest-api-user-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-53673?
- CVE-2026-53673 is a high-severity vulnerability in Buddypress, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.1/10. Published 2026-06-10.
- How severe is CVE-2026-53673?
- High severity. CVSS v3 base score is 8.1 out of 10.