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CVE-2026-33396 is a remote command execution vulnerability in OneUptime affecting versions prior to 10.0.35. A low-privileged authenticated user with the ProjectMember role can abuse Synthetic Monitor Playwright script execution to execute arbitrary commands on the Probe container or underlying host. The issue arises because user-supplied synthetic monitor code is executed in VMRunner.runCodeInNodeVM with a live Playwright page object exposed in the execution context. The sandbox protection depends on a denylist of blocked properties and methods, but that denylist is incomplete. In particular, the Playwright internals _browserType and launchServer are not blocked, allowing attacker-controlled code to traverse page.context().browser()._browserType.launchServer(...) and spawn arbitrary processes.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.