oneuptime up to 10.0.19 this.constructor.constructor routine

Summaryinfo

A vulnerability described as very critical has been identified in oneuptime up to 10.0.19. This issue affects the function this.constructor.constructor. The manipulation results in routine. This vulnerability is cataloged as CVE-2026-30921. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as very critical, was found in oneuptime up to 10.0.19. Affected is the function this.constructor.constructor. The manipulation with an unknown input leads to a routine vulnerability. CWE is classifying the issue as CWE-749. The product provides an Applications Programming Interface (API) or similar interface for interaction with external actors, but the interface includes a dangerous method or function that is not properly restricted. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

OneUptime is a solution for monitoring and managing online services. Prior to 10.0.20, OneUptime Synthetic Monitors allow low-privileged project users to submit custom Playwright code that is executed on the oneuptime-probe service. In the current implementation, this untrusted code is run inside Node's vm and is given live host Playwright objects such as browser and page. This creates a distinct server-side RCE primitive: the attacker does not need the classic this.constructor.constructor(...) sandbox escape. Instead, the attacker can directly use the injected Playwright browser object to reach browser.browserType().launch(...) and spawn an arbitrary executable on the probe host/container. This vulnerability is fixed in 10.0.20.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-30921 since 03/07/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 03/13/2026).

Upgrading to version 10.0.20 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• oneuptime

Version

• 10.0.0
• 10.0.1
• 10.0.2
• 10.0.3
• 10.0.4
• 10.0.5
• 10.0.6
• 10.0.7
• 10.0.8
• 10.0.9
• 10.0.10
• 10.0.11
• 10.0.12
• 10.0.13
• 10.0.14
• 10.0.15
• 10.0.16
• 10.0.17
• 10.0.18
• 10.0.19

Website

• Product: https://github.com/OneUptime/oneuptime/

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