Microsoft 365 Copilot · Microsoft Copilot Tampering Vulnerability
Affects Microsoft 365 CopilotSource GCVE Database
Not known to be exploited · CVSS 6.5 Medium · patch available : update Microsoft 365 Copilot when convenient.
Data as of 26 Oct 2026, 09:16 UTC
- EPSS
- 0.7% chance of exploitation in 30 days – higher than 53% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:CExploitation evidence
Disclosed: evidence found.
CVE published 19 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| MicrosoftMicrosoft 365 Copilot | Affected
| Fixed in– |
Description
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42895 (opens in a new tab)
- msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-42895.json (opens in a new tab)
- microsoft.com/en-us/msrc/exploitability-index?rtc=1 (opens in a new tab)
- support.microsoft.com/lifecycle (opens in a new tab)
- first.org/cvss (opens in a new tab)