CVE-2026-82287

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-28. a secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
Trending — 4 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.1
EG Score
8.1(high)
EG Risk
41(Track)
EG Risk 41/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity81% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
20%
KEV
Not listed

Published

August 28, 2026

Last Modified

August 28, 2026

Advisory Details (5)

Auto-updated Aug 28, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit.
generic

Rybbit Reflects Any Origin in CORS Responses While Allowing Credentials | Advisories | VulnCheck

https://www.vulncheck.com/advisories/rybbit-reflects-any-origin-in-cors-responses-while-allowing-credentials
github_commit Patch Available

commit 6f1039bdd332 (rybbit-io/rybbit)

Patch available: rybbit-io/rybbit v2.7.0 (contains commit 6f1039bdd332)

https://github.com/rybbit-io/rybbit/commit/6f1039bdd3328a84d6700031bc0ce4714020e2f9
generic

rybbit/server/src/index.ts at v2.6.0 · rybbit-io/rybbit · GitHub

https://github.com/rybbit-io/rybbit/blob/v2.6.0/server/src/index.ts
generic

GitHub - rybbit-io/rybbit: 🐸 Rybbit - open-source and privacy-friendly alternative to Google Analytics that is 10x more intuitive. · GitHub

https://github.com/rybbit-io/rybbit
generic🟡 PoC Available

CORS misconfiguration + SameSite=None cookies enable cross-origin CSRF · Issue #1038 · rybbit-io/rybbit · GitHub

https://github.com/rybbit-io/rybbit/issues/1038

Vendor Advisories for CVE-2026-82287(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 7× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 19:28 UTCGHSA enrichment
  3. 2026-08-29 07:58 UTCEG score recompute
  4. 2026-08-29 07:58 UTCGHSA enrichment
  5. 2026-08-28 20:25 UTCEG score recompute
  6. 2026-08-28 19:39 UTCEG score recompute
  7. 2026-08-28 19:36 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-82287?
CVE-2026-82287 is a high vulnerability published on August 28, 2026. 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…
When was CVE-2026-82287 disclosed?
CVE-2026-82287 was first published in the National Vulnerability Database on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82287 actively exploited?
CVE-2026-82287 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 79.8% of all scored CVEs.
What is the CVSS score of CVE-2026-82287?
CVE-2026-82287 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-82287?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82287, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-82287

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