CVE-2026-82287
Rybbit Reflects Any Origin in CORS Responses While Allowing Credentials
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-942 |
| Vendor | rybbit-io |
| Product | rybbit |
| Published | Aug 28, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
rybbit-io / rybbit
0 < 2.7.0
References
github.com: https://github.com/rybbit-io/rybbit/issues/1038 github.com: https://github.com/rybbit-io/rybbit github.com: https://github.com/rybbit-io/rybbit/blob/v2.6.0/server/src/index.ts github.com: https://github.com/rybbit-io/rybbit/commit/6f1039bdd3328a84d6700031bc0ce4714020e2f9 vulncheck.com: https://www.vulncheck.com/advisories/rybbit-reflects-any-origin-in-cors-responses-while-allowing-credentials
Credits
🔍 George Chen