# Security considerations The canonical [social-auth-core threat model](https://github.com/python-social-auth/social-core/blob/master/THREAT_MODEL.md) and [social-auth-app-django threat model](https://github.com/python-social-auth/social-app-django/blob/master/THREAT_MODEL.md) define each package’s trust boundaries, security guarantees, exceptions, and vulnerability triage rules. This page provides deployment guidance; detailed configuration and upgrade instructions live on the linked topic pages. ## Trusted configuration and extensions Settings, provider endpoints, issuers, signing keys, certificates, algorithms, proxies, and redirect destinations must come from trusted operator configuration. Do not let request parameters choose these security policies. Keep required TLS and protocol validation enabled and use intended HTTPS provider endpoints. Certificate verification does not protect a cleartext HTTP endpoint. Retain finite outbound request timeouts. Custom backends, pipelines, strategies, storage, middleware, and templates run with application authority. Preserve validation, policy, and association ordering, and review extensions as security-sensitive code. See [Adding a new backend](backends/implementation.html.md), [Pipeline](pipeline.html.md), [Strategies](strategies.html.md), and [Storage](storage.html.md). Provider profile fields are not automatically verified ownership or local authorization facts. Decide which claims may influence account creation, updates, groups, email association, and recovery. Escape profile data at output sinks. Do not enable `associate_by_email` without an explicit verified-email and recovery policy. See [Pipeline security](pipeline.html.md#pipeline-security) and [External groups](groups.html.md). ## Stable social account identifiers Social associations are authorization bindings. Use stable, provider-scoped identifiers rather than mutable email addresses, usernames, UPNs, or display names. Applications overriding `ID_KEY` must preserve those properties. Drip, Last.fm, and Mixcloud expose no suitable stable identifier and are association-only; they require an authenticated local user. Read [Identifier migration](configuration/identifier-migration.html.md) before upgrading or changing identifier configuration. It documents evidence requirements, audited compatibility exceptions, their first-login race, configuration provenance, and recovery. A missing-evidence compatibility allowance does not establish continuous ownership. For transferable EVE characters, also read [EVE Online Single Sign-On (SSO)](backends/eveonline.html.md). ## Sessions and protected transitions Use a framework integration supplying isolated sessions, authenticated-user state, and CSRF protection for local state changes. Preserve the initiating user through account-linking callbacks; reject or restart a flow if that user changes. Keep tokens, sessions, associations, codes, nonces, partials, and backups confidential and protected from modification. The packages do not provide encryption at rest. Provider callbacks rely on protocol validation. State, nonce, PKCE, and request correlation solve different problems; none replaces the others. Some signed flows do not supply initiation, session binding, or single-use protection. Review the selected backend’s limits, especially [Telegram](backends/telegram.html.md), [Facebook Limited Login](backends/facebook_limited_login.html.md), and legacy iframe flows in [VK.com (former Vkontakte)](backends/vk.html.md) and [Odnoklassniki.ru](backends/odnoklassnikiru.html.md). For Django, see [Django Framework](configuration/django.html.md) for protected routes and launch bridges, [SAML](backends/saml.html.md) for cross-site session restoration, and [Partial Pipeline](pipeline.html.md#partial-pipeline) for confirmation and template requirements. ## OAuth2 transaction state Each OAuth2 authorization start uses a distinct state bound to the initiating browser session. A callback consumes that transaction before exchanging its authorization code. Other pending starts in the same session remain valid and can finish in either order. Expired and repeated callbacks must start again. OAuth2 authorizations begun before upgrading to this behavior also must restart. `SOCIAL_AUTH_STATE_LIFETIME` sets the maximum age in seconds, defaulting to 1800. A provider-specific `SOCIAL_AUTH__STATE_LIFETIME` takes precedence. The value must be a positive integer. Storage integrations must provide an atomic claim shared across workers; see [Nonce](storage.html.md#nonce-storage) for `NonceMixin.consume()` and [Authentication storage cleanup](configuration/django.html.md#authentication-storage-cleanup) for Django cleanup and coordinated upgrade requirements. For legacy OpenID transaction, discovery, and provider binding, including upgrade precautions, see [OpenID](backends/openid.html.md). ## Host headers, redirects, and outbound access Callback and absolute redirect URLs can be derived from the request host. Validate `Host` against intended application hosts, and accept forwarded headers only from trusted proxies that set or strip client-supplied values. Use HTTPS and canonical callback URLs. With Django, configure restrictive `ALLOWED_HOSTS` and enable `USE_X_FORWARDED_HOST` only with an appropriately configured trusted proxy. See [Django security documentation](https://docs.djangoproject.com/en/stable/topics/security/). Keep redirect sanitization enabled and restrict approved hosts and schemes. Explicit private-use schemes authorize by scheme, without host validation. Redirect checks are not SSRF protection or a general egress policy; see [Processing requests and redirects](configuration/settings.html.md#request-redirect-settings). Generic OpenID deliberately supports user-selected provider discovery; expose it only if appropriate for the application and its network policy. Apply request-size, rate, concurrency, capacity, and retention controls suitable for the deployment. The packages supply no quantitative resource guarantee. Constrain provider/discovery egress where required and review access to any configured credential files. Avoid production debug-pipeline output and unsafe logging of authentication data; see [Pipeline security](pipeline.html.md#pipeline-security).