# 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.

- **Severity:** High 7.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N`)
- **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 available:** No
- **Published:** 6 Mar 2026
- **Updated:** 9 Mar 2026
- **Also known as:** GHSA-r36c-83hm-pc8j

## 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 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-29082?

It affects 1 product.


Products: 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.

## 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](https://insights.sbomify.com/CVE-2026-49869/): Kestra OSS OS Command Injection (critical 10.0, exploited in the wild)
- [CVE-2026-53576](https://insights.sbomify.com/CVE-2026-53576/): Kestra: Unauthenticated RCE via /configs path-suffix auth-filter bypass (critical 10.0)
- [CVE-2026-34612](https://insights.sbomify.com/CVE-2026-34612/): Kestra: Remote Code Execution via SQL Injection (critical 10.0)
- [CVE-2026-38428](https://insights.sbomify.com/CVE-2026-38428/): SQL injection in n/a (critical 9.8)
- [CVE-2026-55069](https://insights.sbomify.com/CVE-2026-55069/): Kestra BasicAuth Password Stored as SHA-512 Enables Offline Brute-Force Attack (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-29082 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-29082 exists.

Affected product: kestra-io kestra. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-29082/ (Markdown: https://insights.sbomify.com/CVE-2026-29082/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-29082
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-29082
- OSV: https://osv.dev/vulnerability/CVE-2026-29082

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-29082/
Summaries are generated and may contain mistakes; the official description above is the record.