# CVE-2026-82287: Rybbit Reflects Any Origin in CORS Responses While Allowing Credentials

> Attackers can bypass CORS restrictions to read sensitive data and perform actions on behalf of authenticated users in Rybbit.

- **Severity:** High 8.6 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA: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:** No
- **Published:** 28 Aug 2026
- **Updated:** 24 Sep 2026
- **Also known as:** GHSA-phf4-3733-pwc6

## What is CVE-2026-82287?

CVE-2026-82287 is a high-severity vulnerability in rybbit-io rybbit, published on 28 Aug 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

Rybbit before 2.7.0 contains a CORS misconfiguration vulnerability that allows attackers to bypass origin restrictions by reflecting any request origin in Access-Control-Allow-Origin responses while credentials are enabled. Attackers can issue credentialed cross-origin requests from any website to read analytics data, account information, and perform authenticated state-changing operations as the victim user.

Weakness: CWE-942 (Permissive Cross-domain Security Policy with Untrusted Domains)

## Which versions are affected by CVE-2026-82287?


## How do I fix CVE-2026-82287?

No fix has been published for CVE-2026-82287 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-82287 being exploited?

There is no known exploitation of CVE-2026-82287 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-82287 and fix it if it is affected.

What it is: CVE-2026-82287 is a high-severity vulnerability in rybbit-io rybbit, published on 28 Aug 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-2026-82287 in the wild and no public exploit code.

Affected product: rybbit-io rybbit. 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-2026-82287/ (Markdown: https://insights.sbomify.com/CVE-2026-82287/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-82287
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-82287
- OSV: https://osv.dev/vulnerability/CVE-2026-82287

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-82287/
Summaries are generated and may contain mistakes; the official description above is the record.