Vulnerability-Lookup

CVE-2026-82287 (GCVE-0-2026-82287)

Vulnerability from cvelistv5 – Published: 2026-08-28 16:19 – Updated: 2026-08-31 18:54

Title

Rybbit Reflects Any Origin in CORS Responses While Allowing Credentials

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.

Severity

8.6 (High)


                        
                          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

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-31 16:34 UTC

CWE

CWE-942 - Permissive Cross-domain Security Policy with Untrusted Domains

Assigner

VulnCheck mitre root

References

5 references

URL	Tags
https://github.com/rybbit-io/rybbit/issues/1038	issue-tracking
https://github.com/rybbit-io/rybbit	product
https://github.com/rybbit-io/rybbit/blob/v2.6.0/s…	technical-description
https://github.com/rybbit-io/rybbit/commit/6f1039…	patch
https://www.vulncheck.com/advisories/rybbit-refle…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
rybbit-io	rybbit	Affected: 0 , < 2.7.0 (semver)	guessed

Date Public

2026-07-03 00:00

Credits

George Chen

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-82287

Vulnerability from fkie_nvd - Published: 2026-08-28 20:20 - Updated: 2026-08-31 19:17

Severity

8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Summary

References

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

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-PHF4-3733-PWC6

Vulnerability from github – Published: 2026-08-28 21:31 – Updated: 2026-08-28 21:31

Details

Severity

8.1 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

8.6 (High)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-82287"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-942"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-28T20:20:20Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-phf4-3733-pwc6",
  "modified": "2026-08-28T21:31:27Z",
  "published": "2026-08-28T21:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-82287"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rybbit-io/rybbit/issues/1038"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rybbit-io/rybbit/commit/6f1039bdd3328a84d6700031bc0ce4714020e2f9"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rybbit-io/rybbit"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rybbit-io/rybbit/blob/v2.6.0/server/src/index.ts"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/rybbit-reflects-any-origin-in-cors-responses-while-allowing-credentials"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-82287 (GCVE-0-2026-82287)

FKIE_CVE-2026-82287

GHSA-PHF4-3733-PWC6

Tags

Sightings

Nomenclature