Auth bypass in Evoscientist
CVE-2026-77930
EvoScientist 0.1.0 before 0.2.5 contains an approval bypass vulnerability that allows attackers to run host shell commands by delegating them to async sub-agents lacking an interrupt_on gate. Attackers can plant instructions in ingested content such as fetched web pages, so the agent calls start_async_task and runs commands with user privileges and environment secrets.
Vulnerability class: Broken Access Control
Published .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/EvoScientist/EvoScientist/blob/ac58caab7bdd1706f3fee55891f611cd175d0… (technical-description)
- github.com/EvoScientist/EvoScientist/commit/d249e320bd856a7d31d859cfbb2bf75bab6… (patch)
- github.com/EvoScientist/EvoScientist/issues/387 (issue-tracking)
- EvoScientist v0.2.5 Release Notes (release-notes)
- Lasso.security Advisory (technical-description, exploit)
- VulnCheck Advisory: EvoScientist 0.1.0 before 0.2.5 Human Approval Bypass via Async Sub-Agents (third-party-advisory)
Frequently asked questions
- What is CVE-2026-77930?
- CVE-2026-77930 is a high-severity vulnerability in Evoscientist, classified under Missing Authorization. CVSS score: 8.8/10. Published 2026-10-20.
- How severe is CVE-2026-77930?
- High severity. CVSS v3 base score is 8.8 out of 10.