CVE-2026-30956 OneUptime has authorization bypass via client‑controlled is-multi-tenant-query header
Low-privileged users can bypass tenant isolation and authorization checks via forged headers, leading to cross-tenant data exposure and full account takeover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-30956?
CVE-2026-30956 is a critical authentication bypass vulnerability in oneuptime, published on 10 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
OneUptime is a solution for monitoring and managing online services. Prior to 10.0.21, a low‑privileged user can bypass authorization and tenant isolation in OneUptime v10.0.20 and earlier by sending a forged is-multi-tenant-query header together with a controlled projectid header. Because the server trusts this client-supplied header, internal permission checks in BasePermission are skipped and tenant scoping is disabled. This allows attackers to access project data belonging to other tenants, read sensitive User fields via nested relations, leak plaintext resetPasswordToken, and reset the victim’s password and fully take over the account. This results in cross‑tenant data exposure and full account takeover. This vulnerability is fixed in 10.0.21.
Which versions are affected by CVE-2026-30956?
2 open source packages ship an affected version, including @oneuptime/common. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@oneuptime/common npm | All versions | 10.0.21 |
@oneuptime/common npm | All versions | 10.0.21 |
Products include Hackerbay Oneuptime.
How do I fix CVE-2026-30956?
Upgrade @oneuptime/common to 10.0.21 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-30956 being exploited?
There is no known exploitation of CVE-2026-30956 in the wild and no public exploit code.
Other vulnerabilities in oneuptime
- CVE-2026-33396 Code injection in oneuptime
- CVE-2026-32306 OneUptime ClickHouse SQL Injection via Aggregate Query Parameters
- CVE-2026-30957 OneUptime Synthetic Monitor RCE via exposed Playwright browser object
- CVE-2026-30887 OneUptime Affected by Unsandboxed Code Execution in Probe Allows Any Project Member to Achieve RCE
- CVE-2026-30921 OneUptime Synthetic Monitor RCE via exposed Playwright browser object
Sources
Also known as GHSA-r5v6-2599-9g3m.