HighVulnerabilityLLM-specific

CVE-2026-6662: ericc-ch copilot-api permissive cross-domain policy in CORS handling

Source: NVD(opens in a new tab)
Identifier: CVE-2026-6662
Published: April 20, 2026
Record updated: October 9, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.3%

Summary

CVE-2026-6662 affects ericc-ch copilot-api up to 0.7.0. A flaw in the function cors of src/server.ts, in the Token Endpoint component, produces a permissive cross-domain policy that accepts untrusted domains. The attack can be launched remotely, and public exploit code exists. VulDB scores it CVSS 4.0 6.9 (MEDIUM), with weaknesses CWE-346 and CWE-942.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Details

Scores and exploitation

CVSS score: 7.3(high)
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack vector: network
Attack complexity: low
Privileges required: none
User interaction: none
EPSS: 0.3%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on October 14, 2026.
Disclosure date: April 20, 2026

Weaknesses and techniques

Weakness (CWE): CWE-346
CWE-942

Classification

Attack type: Other
Attack sophistication: Trivial
AI component targeted: API
Impact: Confidentiality,
Integrity
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-6662

First tracked: April 20, 2026 at 02:08 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 85% (self-assessed)

Topics

Coding assistants

Summary

Mitigation

Topics

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