# CVE-2026-100257: Server-side request forgery in YouTrack

> Attackers can perform Server-Side Request Forgery via stored XHTML injection during PDF export in JetBrains YouTrack.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Sep 2026
- **Updated:** 30 Sep 2026
- **Also known as:** GHSA-cr25-22xp-44g2

## What is CVE-2026-100257?

CVE-2026-100257 is a medium-severity server-side request forgery vulnerability in Jetbrains Youtrack, published on 30 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

In JetBrains YouTrack before 2026.2.18991 sSRF via stored XHTML injection was possible during PDF export

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-100257?

It affects 1 product.


Products: Jetbrains Youtrack.

## How do I fix CVE-2026-100257?

No fix has been published for CVE-2026-100257 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-100257 being exploited?

There is no known exploitation of CVE-2026-100257 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-2026-100257 and fix it if it is affected.

What it is: CVE-2026-100257 is a medium-severity server-side request forgery vulnerability in Jetbrains Youtrack, published on 30 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-100257 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-2026-100257/ (Markdown: https://insights.sbomify.com/CVE-2026-100257/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-100257
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-100257
- OSV: https://osv.dev/vulnerability/CVE-2026-100257

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-100257/
Summaries are generated and may contain mistakes; the official description above is the record.