MediumVulnerability

CVE-2026-58616: Copilot Chat (Microsoft Edge) race condition allows info disclosure

Source: NVD(opens in a new tab)
Identifier: CVE-2026-58616
Published: August 28, 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-2026-58616 is a race condition (CWE-362, improper synchronization of a shared resource) in Copilot Chat in Microsoft Edge. An authorized attacker can exploit it over a network to disclose information.

Mitigation

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

Details

Scores and exploitation

CVSS score: 4.4(medium)
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector: network
Attack complexity: high
Privileges required: low
User interaction: required
EPSS: 0.3%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on November 4, 2026.
Disclosure date: August 28, 2026

Weaknesses and techniques

Weakness (CWE): CWE-362
Attack pattern (CAPEC): CAPEC-26
CAPEC-29

Affected

Vendors: Microsoft

Classification

Attack type: Other
Attack sophistication: Moderate
AI component targeted: Plugin
Impact: Confidentiality
Labels: security,
privacy

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-2026-58616

First tracked: August 28, 2026 at 08:08 PM ET, from NVD/CVE Database

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

Classifier confidence: 80% (self-assessed)

Topics

Coding assistants

Summary

Mitigation

Topics

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