What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-28 · updated 2026-09-23
• Weakness: CWE-942

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.

Affected products

• rybbit-io rybbit: before 2.7.0 — fixed in 2.7.0

How to fix

Upgrade to a fixed version: rybbit-io rybbit 2.7.0. Check the vendor advisory for mitigations.

References

• https://github.com/rybbit-io/rybbit
• https://github.com/rybbit-io/rybbit/blob/v2.6.0/server/src/index.ts
• https://github.com/rybbit-io/rybbit/commit/6f1039bdd3328a84d6700031bc0ce4714020e2f9
• https://github.com/rybbit-io/rybbit/issues/1038
• https://www.vulncheck.com/advisories/rybbit-reflects-any-origin-in-cors-responses-while-allowing-credentials

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