High 8.1Published Aug 28, 2026

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

Updated under an hour ago (Oct 27, 2026, 10:00 PM ET)

Does this affect you?

It affects rybbit-io rybbit. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for rybbit-io rybbit

Exploited in the last 30 days

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.

CVSS: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-942
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Sep 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

rybbit-io rybbit rybbit_io:rybbit (from the name)	before 2.7.0	CNA record

References

References

https://github.com/rybbit-io/rybbit/issues/1038	issue-tracking
https://github.com/rybbit-io/rybbit	product
https://github.com/rybbit-io/rybbit/blob/v2.6.0/server/src/index.ts	technical-description
https://github.com/rybbit-io/rybbit/commit/6f1039bdd3328a84d6700031bc0ce4714020e2f9	patch
https://www.vulncheck.com/advisories/rybbit-reflects-any-origin-in-cors-responses-while-allowing-credentials	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.