# CVE-2026-27612: Repostat Vulnerable to Reflected Cross-Site Scripting (XSS) via repo prop in RepoCard

> Attackers can execute arbitrary JavaScript in user browsers via unsanitized repository names in the Repostat React component.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 25 Feb 2026
- **Updated:** 26 Feb 2026
- **Also known as:** GHSA-fm8c-6m29-rp6j

## What is CVE-2026-27612?

CVE-2026-27612 is a medium-severity cross-site scripting vulnerability in denpiligrim repostat, published on 25 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Repostat is a React component to fetch and display GitHub repository info. Prior to version 1.0.1, the `RepoCard` component is vulnerable to Reflected Cross-Site Scripting (XSS). The vulnerability occurs because the component uses React's `dangerouslySetInnerHTML` to render the repository name (`repo` prop) during the loading state without any sanitization. If a developer using this package passes unvalidated user input directly into the `repo` prop (for example, reading it from a URL query parameter), an attacker can execute arbitrary JavaScript in the context of the user's browser. In version 1.0.1, the use of dangerouslySetInnerHTML has been removed, and the repo prop is now safely rendered using standard React JSX data binding, which automatically escapes HTML entities.

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

## Which versions are affected by CVE-2026-27612?

2 open source packages ship an affected version, including repostat. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `repostat` | npm | All versions | 1.0.1 |
| `repostat` | npm | All versions | 1.0.1 |

Products: Denpiligrim Repostat.

## How do I fix CVE-2026-27612?

Upgrade repostat to 1.0.1 or later.

## Is CVE-2026-27612 being exploited?

There is no known exploitation of CVE-2026-27612 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-27612 and fix it if it is affected.

What it is: CVE-2026-27612 is a medium-severity cross-site scripting vulnerability in denpiligrim repostat, published on 25 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-27612 in the wild and no public exploit code.

Affected packages and fixed versions:
- repostat (npm): affected all versions; fixed in 1.0.1
- repostat (npm): affected all versions; fixed in 1.0.1

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-2026-27612/ (Markdown: https://insights.sbomify.com/CVE-2026-27612/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27612
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27612
- OSV: https://osv.dev/vulnerability/CVE-2026-27612

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-27612/
Summaries are generated and may contain mistakes; the official description above is the record.