Vulnerability in Rybbit-Io Rybbit
CVE-2026-82287
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (42.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/rybbit-io/rybbit/issues/1038 (issue-tracking)
- github.com/rybbit-io/rybbit (product)
- github.com/rybbit-io/rybbit/blob/v2.6.0/server/src/index.ts (technical-description)
- github.com/rybbit-io/rybbit/commit/6f1039bdd3328a84d6700031bc0ce4714020e2f9 (patch)
- www.vulncheck.com/advisories/rybbit-reflects-any-origin-in-cors-responses-while… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-82287?
- CVE-2026-82287 is a high-severity vulnerability in Rybbit-Io Rybbit, classified under Permissive Cross-domain Policy with Untrusted Domains. CVSS score: 8.1/10. Published 2026-08-28.
- How severe is CVE-2026-82287?
- High severity. CVSS v3 base score is 8.1 out of 10.