Confluence vs. Notion: Which Is More Secure for Confidential Company Knowledge in 2026

Before you pick a wiki tool, understand what you are actually exposing. An internal wiki is where companies park the things that matter most if they leak: incident postmortems, salary bands, legal memos, customer contracts, source code snippets, and the undocumented workaround that explains how the business really runs. Unlike a chat app, a wiki is built to be searched and shared, which is exactly what makes a misconfigured permission or an exposed public link so damaging. The real risk is rarely a server breach. It is almost always a page shared too widely, a permission inherited from the wrong space, or an integration that was granted more access than anyone remembers approving.

Confluence and Notion take different approaches to containing that risk, and the differences are concrete enough to affect a purchasing decision, not just a preference.

Certifications and audits

Both vendors clear the standard bar. Atlassian's trust documentation lists SOC 2, SOC 3, PCI DSS, ISO/IEC 27001, and ISO/IEC 27018 for Confluence, along with a pre-signed Data Processing Addendum for GDPR transfers. Notion's Trust Center lists SOC 2 Type II (with a public SOC 3 Type II report), ISO/IEC 27001 with annual surveillance audits, ISO 27017, 27018 and 27701, and an attestation against the German BSI C5 cloud controls catalogue. Notion also holds an independent practitioner's letter stating its security and breach notification program conforms to the HIPAA Security Rule and HITECH criteria. Confluence's public security page does not list HIPAA. On paper, Notion's certification list reads slightly broader; in practice, a certification tells you the vendor's controls were audited, not that your specific configuration is safe.

Encryption and key management

Both encrypt data at rest with AES-256 and encrypt traffic in transit. Atlassian specifies TLS 1.2 or later with perfect forward secrecy; Notion describes a three-layer envelope encryption architecture, one layer more than the two-layer model most vendors use. Neither offers end-to-end encryption, so Atlassian and Notion staff can technically access content under their own operational controls, same as almost every hosted wiki on the market. Where the two diverge is customer-held keys: Notion lets Enterprise customers manage their own encryption keys through AWS KMS and revoke the vendor's access at any time. Confluence offers Bring Your Own Key encryption too, but only bundled into Enterprise, alongside data residency controls, not available at lower tiers at any price.

Access control, SSO and admin visibility

This is where the pricing structure becomes a security decision, not just a budget one. Confluence's Standard and Premium plans do not include single sign-on by default. SSO, SCIM provisioning, and most audit logging live behind Atlassian Guard, sold as an add-on subscription on top of Standard and Premium, and bundled in as Guard Standard only once you reach Enterprise. That means a mid-size team on Premium can be paying a meaningful per-seat price and still lack enforced SSO unless it pays again.

Notion folds single sign-on into its Business plan, its second-from-top tier, along with granular database-level permissions that can restrict a collaborator to only the rows assigned to them, private teamspaces, and domain verification. Full admin-grade controls, including an organization-wide audit log, SCIM provisioning, SIEM and DLP connections, and an option to disable external guests entirely, sit in Notion Enterprise, matching where Confluence puts its own Guard Standard bundle. The practical difference is that Notion's SSO threshold sits one tier lower than Confluence's, which matters for any team weighing identity-provider enforcement against a tighter budget.

Real-world incidents and attack surface

Neither company has a clean slate, and a wiki vendor without any disclosed issues should make you more suspicious, not less. Confluence's exposure runs mostly through its self-hosted Data Center and Server editions, which Atlassian patches on a near-monthly security bulletin cycle. Recent entries include CVE-2026-21580, a critical stored cross-site scripting and privilege escalation flaw disclosed in August 2026 and fixed in the 10.2.15 and 9.2.23 long-term support releases, and CVE-2026-41293, a critical injection issue tied to a bundled Tomcat dependency. An older authenticated remote code execution bug, CVE-2024-21683, was confirmed exploited in the wild. If you run Confluence Cloud, Atlassian patches these for you on its own schedule. If you self-host Data Center for data residency reasons, patching becomes your team's job, and the cadence shows this is not a patch-once-a-year product.

Notion's incidents run differently because it is cloud-only. In mid-2026, a forum seller claimed to have 110 million Notion user records for sale. Notion's security team investigated and published a July 2026 update stating the sample data did not match its systems, contained internal duplicates and inconsistent fields, and that it found no evidence any customer was affected; forum administrators independently flagged the seller as fraudulent. Separately, researchers reported that Notion's public page sharing can expose the personal information of anyone who ever edited a page, even after that content is later removed, a structural quirk Notion has acknowledged and said it is still working to fix architecturally. And in late 2025, researchers at CodeIntegrity showed that malicious PDFs could manipulate Notion's autonomous AI agents into exfiltrating private workspace data to attacker-controlled servers, prompting Notion to add external link safeguards.

Pricing and what it buys you

Confluence runs Free for up to 10 users, Standard starting around $6.40 per user per month, and Premium starting around $12.30 per user per month, with Enterprise custom-quoted and billed annually; those starting figures come from third-party trackers rather than a published Atlassian rate card, so confirm current numbers before budgeting. Notion is more transparent: Free, Plus at $10 per user per month, Business at $20 per user per month, and a custom-quoted Enterprise tier. Measured purely against what security controls each dollar buys, Notion's Business plan gets you SSO and granular permissions for less than Confluence's Premium plan gets you neither.

Side by side

	Confluence	Notion
Encryption at rest	AES-256	AES-256, three-layer envelope encryption
Encryption in transit	TLS 1.2+ with forward secrecy	TLS
Customer-managed keys (BYOK)	Enterprise only	Enterprise only, via AWS KMS
SSO included from	Enterprise (via Atlassian Guard Standard)	Business, $20/user/month
Granular, row or page-level permissions	Enterprise-level admin controls	Business plan and up
Full audit log, SCIM, SIEM/DLP	Enterprise	Enterprise
Key certifications	SOC 2, SOC 3, PCI DSS, ISO 27001, ISO 27018	SOC 2 Type II, ISO 27001/17/18/701, HIPAA conformance letter, BSI C5
Deployment options	Cloud or self-hosted Data Center	Cloud only
Disclosed 2025-2026 issue	Critical CVEs in Data Center/Server, patched monthly	Unverified breach claim (debunked), public-page PII exposure quirk

Which should you pick

If your organization already runs on Atlassian Guard for Jira, adding Confluence Enterprise is often the path of least resistance, and self-hosting Data Center still makes sense if data residency requirements outweigh the patching burden your team is willing to carry. If you are a smaller team that needs enforced SSO and row-level permissions without committing to an enterprise contract, Notion's Business tier reaches those controls at a meaningfully lower price point. If your wiki will hold regulated health data, get a signed BAA and confirm HIPAA scope directly with either vendor rather than relying on a marketing page.

Verdict

We would not call either platform unsafe, and we would not call either one safe by default. Confluence's security ceiling is high but it is locked behind Guard and Enterprise pricing, and self-hosting shifts real patching responsibility onto you. Notion reaches meaningful access controls earlier in its pricing ladder, but its public-sharing model and newer AI agent features carry their own disclosed weak points. Whichever you choose, the setting that matters most is the one a vendor cannot sell you: who in your company can create a public link, and whether anyone is checking.