CVE-2026-26133: M365 Copilot Information Disclosure Vulnerability
Telemetry drift only. No threshold crossed and no authority ruling changed.
CVE record, CISA KEV and EPSS as of 2026-10-18.
CVEs like this one computed, by meaning
What to do now held facts and links
- Upgrade to the fixed version for your release line, or later: 16.0.19815.10000; 2.107.2; 145.3800.99; 16.0.19822.20038; 2.106.26020617; 16.0.19725.20142; 5.2605; 2.2.260210.21290750; 1.2.260302.2193910; 1.0.0.2026043102… CVE record
- Record your decision, dated and frozen with today's evidence: patch by a date · mitigated by a compensating control · deferred · accepted the risk · not affected
- Check your version against the ranges this record publishes.
What it is stated by the CNA
AI command injection in M365 Copilot allows an unauthorized attacker to disclose information over a network.
- weakness
- CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')
- affected
- Microsoft 365 Copilot for Android; Microsoft 365 Copilot for iOS; Microsoft Edge for Android; Microsoft Edge for iOS; Microsoft Excel for Android; Microsoft Excel for iOS; Microsoft Loop for iOS; Microsoft OneNote; Microsoft OneNote for Android; Microsoft Outlook for Android; Microsoft Outlook for iOS; Microsoft Outlook for Mac; Microsoft PowerBI for Android; Microsoft PowerBI for iOS; Microsoft PowerPoint for Android; Microsoft PowerPoint for iOS; Microsoft Teams for Android; Microsoft Teams for iOS; Microsoft Word for Android; Microsoft Word for iOS
- published ranges
- microsoft 365 copilot < 2.107.2; microsoft 365 copilot < 16.0.19815.10000; microsoft edge < 145.3800.99; microsoft excel < 2.106.2; and 11 more on the CVE page
- fixed in
- 16.0.19815.10000; 2.107.2; 145.3800.99; 16.0.19822.20038; 2.106.26020617; 16.0.19725.20142; 5.2605; 2.2.260210.21290750; 1.2.260302.2193910; 1.0.0.2026043102…
- severity
- 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C
- assigned by
- microsoft
- published
- 2026-03-13
check us msrc.microsoft.com
Exploit code held, dated
- exploit code
- None held in the PoC-in-GitHub feed. A public repository changes this brief.
What moved held, dated
| date | EPSS | event |
|---|---|---|
| 14 Mar 2026 | 0.00061 | |
| 19 Mar 2026 | 0.00048 | |
| 8 Apr 2026 | 0.00053 | |
| 14 Apr 2026 | 0.00058 | |
| 21 Apr 2026 | 0.00047 | |
| 20 May 2026 | 0.00054 | |
| 15 Jun 2026 | 0.00433 | scoring model v2026.06.15 |
| 28 Sep 2026 | 0.00541 | |
| 12 Oct 2026 | 0.00562 |
9 observations held. A step marked with a scoring model moved because the measurement was replaced, not because the vulnerability changed.
Outside the record researched, cited
This section reads the record's references and adds cited findings from outside it. It needs an account. Everything above is held facts and is complete without it.
What would change this brief held, dated
- CISA KEV
- Not listed in the catalogue we hold. A listing changes this brief.
- exploit probability
- 0.01 on 2026-10-12 (FIRST's EPSS, a probability and not evidence of exploitation). Next band line: 10% (0.10). Crossing a line changes this brief.
- fix
- Held: 16.0.19815.10000; 2.107.2; 145.3800.99; 16.0.19822.20038; 2.106.26020617; 16.0.19725.20142; 5.2605; 2.2.260210.21290750; 1.2.260302.2193910; 1.0.0.2026043102…. A newer fix from the CNA or OSV changes this brief.
How to check this
Every value above is held with two dates: when it was true upstream (as_of) and when we recorded it (tx_from). Re-derive the exploit probability as it stood on any date:
SELECT value, source, source_version, as_of, tx_from
FROM volatile_valid_as_of('CVE-2026-26133', '2026-11-02T23:59:59.999999Z', now());