Four-part audit (OIDC/JWT/crypto, user sync, admin UI, login bypasses)
with dynamic PoCs against a real WordPress install; every fix is covered
by a regression test. Report: docs/security-audit.md, section 6.
Critical/High
- Multisite: settings, AJAX actions and certificate download require
manage_network_options (site admins could sign in as super admin).
- Privileged accounts are only linked (sync and first sign-in) via a
matching UPN of a member account, never via the settable mail
attribute; the sync never changes their e-mail address; e-mail change
notifications stay on.
- Button-only mode exempts by credential (application passwords, WP-CLI)
instead of request context, closing bypasses through xmlrpc.php and
REST login handlers; API requests never receive login cookies.
- Multi-tenant mode refuses guest/external identities.
Medium/Low
- Same message for right and wrong passwords; button-only no longer
switches off when the connection breaks; server-side fallback cookie
expiry; correct fallback key beats IP lockouts; right-most proxy hop;
higher start limit; one object ID per account.
- Deactivation sets a random password, revokes application passwords and
removes the role (restored on reactivation); disabled people are
deactivated even when their mail vanished; duplicate bindings handled.
- Sync: abort on empty directory answer, no deprovisioning right after a
tenant change, atomic run lock, strict photo path validation.
- Certificates: key bundles refused, clean re-exported certificate.
- Array-safe sanitising, encoded redirect_to, per-action nonces, escaped
role lists, no Graph sleeps during sign-in, warnings for public groups,
multi-tenant group rules and missing salts, uninstall clears the token.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
New "Excluded Entra groups" card on the Security tab. Members of these
groups (nested memberships count) can never sign in with Microsoft, even
if they are in an allowed group.
A hit in the ID token's groups claim refuses immediately. Otherwise the
plugin always asks Microsoft Graph (checkMemberGroups), because a groups
claim can be filtered in the app registration and cannot prove
non-membership. Graph errors refuse the sign-in (fail closed).
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
New "User sync" tab that imports Microsoft 365 / Entra ID users as
WordPress accounts and keeps them up to date:
- Scope: whole tenant or the (nested) members of selected groups,
guests optional, e-mail domain allow-list respected. Existing accounts
are linked by e-mail address.
- Roles: selectable default role plus a group -> role mapping (in
addition to or instead of the default role, first match wins).
Roles of pre-existing accounts are only managed on request.
- Profile: selectable Graph attributes (names, job title, department,
phones, address, language, ...) and the profile photo as avatar.
- Deprovisioning: accounts disabled or deleted in Microsoft 365 (or
removed from the sync groups) are deactivated or deleted; accounts
deactivated by the sync are reactivated automatically. Deactivated
accounts lose every sign-in path and all sessions.
- Safeguards: dry run, safety stop above 20 % (min. 5) deprovisioning,
abort on any Graph error, "deleted" only on a 404 for the object ID,
protected pre-existing administrators and own account, content
reassignment required for deletion, run lock.
- Runs manually, via WP-Cron or `wp m365-login sync [--dry-run]`.
- Users screen column with deactivate/reactivate row actions and a
read-only Microsoft 365 section on the profile screen.
The Graph client gains paging, retry on throttling and user, group
member and photo endpoints. The group picker is now reusable.
Version 1.1.0, German translations (du/Sie), docs and audit addendum.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Certificate (RFC 7523 client assertion) as an alternative to the client
secret: one-click generation of a 3072-bit RSA key pair with a
self-signed certificate, .cer download (public part only), own PEM
upload with validation, expiry display, encrypted key storage. Both the
authorization code exchange and the Graph client-credentials request
use the selected method. Step-by-step guides for secret, certificate
and the app registration are shown in the settings.
Security audit (docs/security-audit.md) and fixes:
- Multi-tenant mode ignored the unverified email claim: matching now
uses the UPN only, or the email claim when xms_edov is true.
- Login starts are rate limited per client (30 per 10 minutes).
- Optional trusted proxy header for client IPs
(M365_LOGIN_CLIENT_IP_HEADER / filter).
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JJxAHYdMfKPoN4koRc4Ci2
