What is the CVSS score of CVE-2026-30956?

CVE-2026-30956 has a CVSS 3.1 base score of 9.9 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Is there a public PoC exploit available for CVE-2026-30956?

Yes, a public proof-of-concept exploit is available for CVE-2026-30956. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-30956?

Within 24 hours: Inventory all OneUptime instances and their versions, isolate affected systems from production networks if possible, and contact OneUptime vendor for emergency patch timeline. Within 7 days: Implement network-level access controls to restrict OneUptime API endpoints, deploy WAF rules to block forged is-multi-tenant-query headers, and enforce strict input validation on projectid parameters. Within 30 days: Upgrade to OneUptime v10.0.21 or later when available, conduct security audit of OneUptime access logs for exploitation signs, and implement additional multi-factor authentication for OneUptime administrative access.

Oneuptime CVE-2026-30956

Q: Which versions of Oneuptime are affected by CVE-2026-30956?

A critical vulnerability in OneUptime allows unauthorized users to bypass security controls and access data across different customer environments, potentially exposing sensitive monitoring and…. A patch is available.

CRITICAL

Improper Authorization (CWE-285)

2026-03-10 security-advisories@github.com

GHSA-r5v6-2599-9g3m

Authentication Bypass Information Disclosure Oneuptime Hackerbay

9.9

CVSS 3.1 · Vendor: github

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Low-privileged user crafts HTTP request
Exploit

Include forged is-multi-tenant-query header with controlled projectid
Execution

Bypass BasePermission authorization checks
Impact

Access cross-tenant project data and sensitive fields

Vulnerability Assessment

Weakness	CWE CWE-285 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V8 - Authorization Authorization verification MITRE ATT&CK 1 technique across 1 tactic: Defense Evasion The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	OneUptime v10.0.20 and earlier with multi-tenant architecture enabled. Attacker requires valid low-privileged user credentials. Server must trust client-supplied is-multi-tenant-query and projectid headers without validation.
Impact	CVSS 9.9 with PoC.
Exploit ScenarioDerived	A low-privileged user accesses admin monitoring functions.

Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

OneUptime prior to 10.0.21 has a third authorization bypass enabling low-privileged users to access admin functions.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 9.9

Third OneUptime authorization bypass enables privilege escalation.

RemediationAI

Update OneUptime.

Affected Packages

npm @oneuptime/common fix: 10.0.21

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in npm

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

OneUptime < 10.0.21 has a CWE-285 authorization bypass. Third critical vulnerability.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (github) PRIMARY 9.9 CRITICAL

AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Primary rating from Vendor (github) · only source for this CVE.

CVSS VectorVendor: github

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

PoC Detected

Mar 12, 2026 - 14:11 vuln.today

Public exploit code

CVE Published

Mar 10, 2026 - 18:18 nvd

CRITICAL 9.9

DescriptionCVE.org

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.

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

1 npm packages depend on @oneuptime/common (1 direct, 0 indirect)

Ecosystem-wide dependent count for version 10.0.21.

Executive ViewAI

Why It Matters

A critical vulnerability in OneUptime allows unauthorized users to bypass security controls and access data across different customer environments, potentially exposing sensitive monitoring and service management information. This affects all OneUptime deployments on v10.0.20 and earlier and requires immediate action despite no official patch being available.

Business Impact: Severe

Compensating Controls

Implement WAF rules to detect and block requests containing suspicious is-multi-tenant-query headers; enforce strict network segmentation to limit OneUptime API access to trusted internal networks only; deploy API gateway with request validation to sanitize projectid parameters; enable enhanced logging and monitoring for authentication bypass attempts; restrict OneUptime administrative credentials to minimal privileged accounts; consider disabling multi-tenant functionality if not required for operations; implement network-based rate limiting on OneUptime endpoints.

Threat Intelligence Overview

EPSS Score

0.0%

Top 88% exploitable

Exploit

POC

Public exploit code exists

Data Quality

5 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC Yes

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

CRITICAL severity + public POC available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +50

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.