CVE-2026-49869 Kestra OSS OS Command Injection
Unauthenticated attackers can bypass authentication via a suffix match flaw to execute arbitrary workflows and achieve remote code execution as root.
- Exploited in the wild
- Since 2 Sep 2026
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-49869?
CVE-2026-49869 is a critical authentication bypass vulnerability in kestra-io kestra, published on 26 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, AuthenticationFilter in Kestra OSS uses request.getPath().endsWith("/configs") to whitelist the public configuration endpoint from Basic Auth. Because the check is a suffix match rather than an exact path match, any API path whose last segment is configs bypasses authentication entirely. An unauthenticated remote attacker can exploit this to create and execute arbitrary workflows without credentials. Because Kestra ships with script execution plugins (plugin-script-shell, plugin-script-python, etc.) enabled by default, this directly results in unauthenticated Remote Code Execution as root inside the Kestra worker container. This vulnerability is fixed in 1.0.45 and 1.3.21.
Which versions are affected by CVE-2026-49869?
It affects 1 product.
Products include Kestra Kestra.
How do I fix CVE-2026-49869?
No fix has been published for CVE-2026-49869 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 5 Sep 2026.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-49869 being exploited?
Yes. Attackers have exploited CVE-2026-49869 in the wild since at least 2 Sep 2026.
Public exploit code: 2 proofs of concept on GitHub.
Other vulnerabilities in kestra-io kestra
- CVE-2026-53576 Kestra: Unauthenticated RCE via /configs path-suffix auth-filter bypass
- CVE-2026-34612 Kestra: Remote Code Execution via SQL Injection
- CVE-2026-38428 SQL injection in n/a
- CVE-2026-55069 Kestra BasicAuth Password Stored as SHA-512 Enables Offline Brute-Force Attack
- CVE-2026-45807 Kestra: Path traversal via URL-encoded "%2E%2E" in execution and namespace file endpoints allows arbitrary file read
Sources
Also known as GHSA-5vc5-wxxq-3fjx.