# CVE-2026-103489: Cross-site scripting in YouTrack

> Attackers can inject HTML into VCS command failure notifications in JetBrains YouTrack, potentially leading to script execution or account takeover.

- **Severity:** Low 2.0 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 1 Oct 2026
- **Updated:** 1 Oct 2026
- **Also known as:** GHSA-26rm-75r8-j682

## What is CVE-2026-103489?

CVE-2026-103489 is a low-severity cross-site scripting vulnerability in Jetbrains Youtrack, published on 1 Oct 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

In JetBrains YouTrack before 2026.2.19422 hTML injection in VCS command failure notifications was possible

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-103489?

It affects 1 product.


Products: Jetbrains Youtrack.

## How do I fix CVE-2026-103489?

No fix has been published for CVE-2026-103489 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-103489 being exploited?

There is no known exploitation of CVE-2026-103489 in the wild and no public exploit code.

## Other vulnerabilities in Jetbrains Youtrack

- [CVE-2026-62422](https://insights.sbomify.com/CVE-2026-62422/): Auth bypass in YouTrack (critical 10.0)
- [CVE-2022-24442](https://insights.sbomify.com/CVE-2022-24442/): Code injection in n/a (critical 9.8)
- [CVE-2021-43185](https://insights.sbomify.com/CVE-2021-43185/): Other in n/a (critical 9.8)
- [CVE-2021-25770](https://insights.sbomify.com/CVE-2021-25770/): Code injection in n/a (critical 9.8)
- [CVE-2019-12850](https://insights.sbomify.com/CVE-2019-12850/): SQL injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-103489 and fix it if it is affected.

What it is: CVE-2026-103489 is a low-severity cross-site scripting vulnerability in Jetbrains Youtrack, published on 1 Oct 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-103489 in the wild and no public exploit code.

Affected product: Jetbrains Youtrack. 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-2026-103489/ (Markdown: https://insights.sbomify.com/CVE-2026-103489/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-103489
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-103489
- OSV: https://osv.dev/vulnerability/CVE-2026-103489

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-103489/
Summaries are generated and may contain mistakes; the official description above is the record.