# CVE-2026-59794: Cross-site scripting in TeamCity

> Stored XSS in JetBrains TeamCity allows attackers to execute scripts via agent-reported data on the cloud profile page.

- **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:** 10 Jul 2026
- **Updated:** 10 Jul 2026
- **Also known as:** GHSA-5526-463r-44x5

## What is CVE-2026-59794?

CVE-2026-59794 is a high-severity cross-site scripting vulnerability in Jetbrains Teamcity, published on 10 Jul 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

In JetBrains TeamCity before 2026.1.2 stored XSS on the cloud profile page was possible via agent-reported data

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

## Which versions are affected by CVE-2026-59794?

It affects 1 product.


Products: Jetbrains Teamcity.

## How do I fix CVE-2026-59794?

No fix has been published for CVE-2026-59794 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-59794 being exploited?

There is no known exploitation of CVE-2026-59794 in the wild and no public exploit code.

## Other vulnerabilities in Jetbrains Teamcity

- [CVE-2026-63077](https://insights.sbomify.com/CVE-2026-63077/): JetBrains TeamCity Deserialization of Untrusted Data (critical 9.8, exploited in the wild)
- [CVE-2024-27198](https://insights.sbomify.com/CVE-2024-27198/): JetBrains TeamCity Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2023-42793](https://insights.sbomify.com/CVE-2023-42793/): JetBrains TeamCity Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2024-27199](https://insights.sbomify.com/CVE-2024-27199/): JetBrains TeamCity Relative Path Traversal (high 7.3, exploited in the wild)
- [CVE-2024-23917](https://insights.sbomify.com/CVE-2024-23917/): Auth bypass in TeamCity (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-59794 and fix it if it is affected.

What it is: CVE-2026-59794 is a high-severity cross-site scripting vulnerability in Jetbrains Teamcity, published on 10 Jul 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-59794 in the wild and no public exploit code.

Affected product: Jetbrains Teamcity. 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-2026-59794/ (Markdown: https://insights.sbomify.com/CVE-2026-59794/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-59794
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-59794
- OSV: https://osv.dev/vulnerability/CVE-2026-59794

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-59794/
Summaries are generated and may contain mistakes; the official description above is the record.