CVE-2026-47644
CVE-2026-47644 is a medium-severity vulnerability in Microsoft Copilot Chat with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-74.
Key facts
- Severity: Medium (CVSS 3.x base score 6.5)
- EPSS exploit prediction: 1% (50th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-34336
- Weakness: CWE-74
- Affected product: Microsoft Copilot Chat
- Published:
- Last modified:
Description
Improper neutralization of special elements in output used by a downstream component ('injection') in Copilot Chat (Microsoft Edge) allows an unauthorized attacker to disclose information over a network.
Frequently asked questions
- What is CVE-2026-47644?
- Improper neutralization of special elements in output used by a downstream component ('injection') in Copilot Chat (Microsoft Edge) allows an unauthorized attacker to disclose information over a network.
- How severe is CVE-2026-47644?
- CVE-2026-47644 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
- Is CVE-2026-47644 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-47644?
- CVE-2026-47644 affects Microsoft Copilot Chat. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-47644?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-47644 have an EU (EUVD) identifier?
- Yes. CVE-2026-47644 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34336.
- When was CVE-2026-47644 published?
- CVE-2026-47644 was published on 2026-06-04 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:microsoft:copilot_chat:-:*:*:*:*:microsoft_edge:*:*
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