Vulnerability · Published May 7, 2026 · Assigned by ENISA
CVE-2026-33587Remote Code Execution (RCE) via Server-Side Template Injection (SSTI)
Critical 9.2
In plain English
A critical-severity improper input validation in Open Notebook from Open Notebook. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities).
Severity (CVSS 4.0)9.2Critical
Exploit odds (30 days)0.2%top 86.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and subsequently OS commands) on the docker container via Server-Side Template Injection (SSTI) for user-created transformations.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Open Notebook | Open Notebook | 0 – through 1.8.3 |
Weakness: CWE-20 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N