CVE-2026-29082 Kestra: Stored Cross-Site Scripting in Markdown File Preview
Attackers can execute arbitrary scripts in victim browsers via unsanitized Markdown previews in Kestra, potentially leading to session hijacking or data theft.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-29082?
CVE-2026-29082 is a high-severity cross-site scripting vulnerability in kestra-io kestra, published on 6 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Kestra is an event-driven orchestration platform. In versions from 1.1.10 and prior, Kestra’s execution-file preview renders user-supplied Markdown (.md) with markdown-it instantiated as html:true and injects the resulting HTML with Vue’s v-html without sanitisation. At time of publication, there are no publicly available patches.
Weakness: CWE-79
Which versions are affected by CVE-2026-29082?
It affects 1 product.
Products include Kestra Kestra.
How do I fix CVE-2026-29082?
No fix has been published for CVE-2026-29082 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-29082 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-29082 exists.
Other vulnerabilities in kestra-io kestra
- CVE-2026-49869 Kestra OSS OS Command Injection
- 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
Sources
Also known as GHSA-r36c-83hm-pc8j.