High
Microsoft Exchange Server Elevation of Privilege Vulnerability
Improper verification of cryptographic signature in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Announced Group revision 1
Original source ↗CVE-2026-87696
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-87696
Microsoft Exchange Server 2016 Cumulative Update 23
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Microsoft Exchange Server 2019 Cumulative Update 14
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Microsoft Exchange Server 2019 Cumulative Update 15
Source reference: /containers/cna/affected/2/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Microsoft Exchange Server Subscription Edition RTM
Source reference: /containers/cna/affected/3/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2016 Cumulative Update 23",
"versions": [
{
"status": "affected",
"version": "15.01.0.0",
"lessThan": "15.01.2507.077",
"versionType": "custom"
}
],
"platforms": [
"x64-based Systems"
]
},
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2019 Cumulative Update 14",
"versions": [
{
"status": "affected",
"version": "15.02.0.0",
"lessThan": "15.02.1544.050",
"versionType": "custom"
}
],
"platforms": [
"x64-based Systems"
]
},
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2019 Cumulative Update 15",
"versions": [
{
"status": "affected",
"version": "15.02.0.0",
"lessThan": "15.02.1748.055",
"versionType": "custom"
}
],
"platforms": [
"x64-based Systems"
]
},
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server Subscription Edition RTM",
"versions": [
{
"status": "affected",
"version": "15.02.0.0",
"lessThan": "15.02.2562.056",
"versionType": "custom"
}
],
"platforms": [
"x64-based Systems"
]
}
]- Related CVEs
- CVE-2026-87696
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #55103 · Revision 1
- Added to Heist Feed
- Publisher date