Auth bypass in Rmyndharis Openwa
CVE-2026-91161
OpenWA is a free, open source, self-hosted WhatsApp API gateway. Prior to 0.23.5, the GET /api/sessions/{sessionId}/groups/{groupId}/invite-code endpoint and the GroupGetInviteCode MCP tool have no OPERATOR role requirement, allowing a valid VIEWER key scoped to a session to retrieve an active group invite code. The invite code is a transferable WhatsApp bearer capability, so an external account can join a group administered by the session without an OpenWA credential, gain read and post access to the group, and retain membership after the VIEWER key is revoked. Affected deployments are those that issue VIEWER keys to parties who should not be able to add accounts to administered groups; OPERATOR and ADMIN access is intended. This issue is fixed in version 0.23.5.
Vulnerability class: Broken Access Control
Published .
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Rmyndharis Openwa — versions < 0.23.5
Weakness classification (CWE)
References
- github.com/rmyndharis/OpenWA/security/advisories/GHSA-45fh-xj7x-vj2x
- github.com/rmyndharis/OpenWA/pull/1572
- github.com/rmyndharis/OpenWA/commit/a888a0121543426d4e1bf55f9edaed8306ae2699
- github.com/rmyndharis/OpenWA/commit/d66439db9653c7aa7cbfb763003c8d3cbc8f623c
- github.com/rmyndharis/OpenWA/releases/tag/v0.23.5
Frequently asked questions
- What is CVE-2026-91161?
- CVE-2026-91161 is a medium-severity vulnerability in Rmyndharis Openwa, classified under Incorrect Authorization. CVSS score: 6.4/10. Published 2026-09-24.
- How severe is CVE-2026-91161?
- Medium severity. CVSS v3 base score is 6.4 out of 10.