CVE-2026-82287CWE-942

CVE-2026-82287

High · published August 29, 2026

CVSS v3.1
8.1
EPSS
1%
Percentile
42.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CVSS v4.0
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
EPSS
0.00513 · 42.8th percentile
Weakness
CWE-942 · Permissive Cross-domain Security Policy with Untrusted Domains
Published
2026-08-29T00:20Z
References (5)
https://github.com/rybbit-io/rybbit/issues/1038 · [email protected]https://www.vulncheck.com/advisories/rybbit-reflects-any-origin-in-cors-responses-while-allowing-credentials · [email protected]https://github.com/rybbit-io/rybbit · [email protected]https://github.com/rybbit-io/rybbit/blob/v2.6.0/server/src/index.ts · [email protected]https://github.com/rybbit-io/rybbit/commit/6f1039bdd3328a84d6700031bc0ce4714020e2f9 · [email protected]
EPSS history
Timeline
  • 30 AUG 16:19Z
    EPSS moved — → 0%
    epss
  • 28 AUG 16:19Z
    Rybbit Reflects Any Origin in CORS Responses While Allowing Credentials
    cvelistv5