🛡️ CVE-2026-26133 — 365-copilot

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity low, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

• Attack vector: Network — reachable from anywhere that can route to the service.
• Attack complexity: Low — the attack works reliably, with no preparation.
• Privileges required: None — an unauthenticated stranger can try it.
• User interaction: Required — someone has to click, open or visit something.
• Scope: Unchanged — the damage stays inside the vulnerable component.
• Confidentiality impact: High — total loss, or loss the attacker controls.
• Integrity impact: Low — limited, and the attacker does not choose what is affected.
• Availability impact: None.

Weakness class

CVE-2026-26133 is classified as CWE-77: Command Injection. User input is placed into a command that the system interprets, allowing extra commands to be appended to the intended one.

Affected software

CVE-2026-26133 is recorded against 10 packages.

• 365-copilot (fixed in 16.0.19815.10000)
• edge (fixed in 145.3800.99)
• excel (fixed in 16.0.19822.20038)
• loop (fixed in 2.106)
• onenote
• outlook
• power-bi
• powerpoint (fixed in 16.0.19822.20038)
• teams (fixed in 8.3.1)
• word (fixed in 16.0.19822.20038)

Timeline and source

Published on 16 March 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

msrc.microsoft.com

Other advisories for this package

365-copilot has other advisories on record. If you are patching this one, these are worth checking on the same host:

• CVE-2026-50517 (9.9 Critical, published 24 Jul 2026)
• CVE-2026-48561 (9.6 Critical, published 14 Jul 2026)
• CVE-2026-58617 (8.1 High, published 14 Jul 2026)
• CVE-2026-50387 (7.8 High, published 14 Jul 2026)
• CVE-2026-41106 (9.3 Critical, published 2 Jul 2026)
• CVE-2026-42895 (6.5 Medium, published 19 Jun 2026)
• CVE-2026-47645 (8.8 High, published 19 Jun 2026)
• CVE-2026-54130 (9.8 Critical, published 18 Jun 2026)

Same weakness in other software

These advisories are the same class of weakness (CWE-77: Command Injection) in other software:

• CVE-2025-29296 (9.8 Critical, published 4 Aug 2026)
• CVE-2024-58354 (9.9 Critical, published 23 Jul 2026)
• CVE-2014-6633 (8.0 High, published 9 Jul 2026)
• CVE-2025-4032 (2.0 Low, published 7 Jul 2026)
• CVE-2023-39523 (6.8 Medium, published 7 Jul 2026)
• CVE-2022-42906 (8.0 High, published 7 Jul 2026)
• CVE-2024-4078 (9.8 Critical, published 7 Jul 2026)
• CVE-2024-0817 (8.0 High, published 7 Jul 2026)

Details

Affected Packages

References