TI-2026-56752 Aliases CVE-2026-82287 GHSA-phf4-3733-pwc6

Rybbit Reflects Any Origin in CORS Responses While Allowing Credentials

MEDIUM 44CWE-942Published 2026-08-28 · Updated 2026-09-24

Key facts

Attack vector: Network
Privileges required: None
User interaction: Passive
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00513 43rd percentileScored 2026-11-07

Fix Fixed rybbit (rybbit-io): 2.7.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
rybbit-io	rybbit	before 2.7.0	2.7.0	Patch available	CNA

rybbit Vendorrybbit-io Affected before 2.7.0 Fixed in 2.7.0 Patch available CNA

Remediation

Fix · CNA rybbit (rybbit-io) Fixed in 2.7.0

Timeline

2026-10-02 Threatist record created from CVE-2026-82287
2026-10-03 Alias added: GHSA-phf4-3733-pwc6

References

Patch 1

Fix commit

Other 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences