Recorded 26 Oct 2026 at 23:57 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position. See the latest record.

The historical field “Public exploit code” recorded Nuclei detection-template membership. It did not establish exploit availability. The original recorded fields remain below.

The historical “Publicly disclosed: No” field could represent a missing MSRC assessment. It does not establish that the vulnerability was undisclosed. The original recorded fields remain below.

CVEMicrosoft Security Response Center

Microsoft Exchange Server Denial of Service Vulnerability

Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.

What it said

CVE: CVE-2026-69378
Severity: Important
CVSS base score: 7.5
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
Impact: Denial of Service
Exploitation detected: Not reported by MSRC
Publicly disclosed: No
Exploitability: Exploitation Less Likely
Component: Microsoft Exchange Server
Weakness: CWE-674: Uncontrolled Recursion
Issued by: Microsoft
Customer action: Required: apply the update
Affected products: Microsoft Exchange Server 2016 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 14, Microsoft Exchange Server 2019 Cumulative Update 15, Microsoft Exchange Server Subscription Edition RTM
Updates that fix it: KB5121608: Microsoft Exchange Server Subscription Edition RTM (restart required); KB5121609: Microsoft Exchange Server 2019 Cumulative Update 15 (restart required); KB5121610: Microsoft Exchange Server 2019 Cumulative Update 14 (restart required); KB5121611: Microsoft Exchange Server 2016 Cumulative Update 23 (restart required)
CISA KEV: Not listed in the collected catalog
EPSS: 1.2%; scored 26 Oct 2026
Public exploit code: No Nuclei template listed
Published: 8 Sep 2026 07:00 UTC
Last revised: 8 Sep 2026 07:00 UTC
Revision note: Information published.

Recorded links

Source evidence when recorded

Microsoft security releases: Complete at observationRead 26 Oct 2026 at 23:56 UTC
CISA KEV: Complete at observationRead 26 Oct 2026 at 23:56 UTC
FIRST EPSS: Complete at observationRead 26 Oct 2026 at 23:56 UTC
Public detection templates (Nuclei): Complete at observationRead 26 Oct 2026 at 23:56 UTC

Coverage describes the sources at this observation. A complete read then does not establish their current position.

What changed

Detection template: Unknown: exploit-code evidence is incomplete or retained → No Nuclei template listed · CISA KEV: Unknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
23 Oct 2026 · 09:33:49 UTC
Detection template: No Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained · CISA KEV: Not listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
23 Oct 2026 · 08:31:50 UTC

Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version

Field-level log (26)

Up to 100 recent field edits are shown; older edits may be outside retention.

26 Oct 2026 · 23:57:09 UTC EPSS1.2%; scored 25 Oct 2026 → 1.2%; scored 26 Oct 2026
25 Oct 2026 · 17:12:51 UTC EPSS1.2%; scored 24 Oct 2026 → 1.2%; scored 25 Oct 2026
25 Oct 2026 · 01:34:18 UTC EPSS1.2%; scored 23 Oct 2026 → 1.2%; scored 24 Oct 2026
23 Oct 2026 · 15:51:28 UTC EPSS1.2%; scored 22 Oct 2026 → 1.2%; scored 23 Oct 2026
23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
23 Oct 2026 · 08:31:50 UTC Source coverage: first-epssCurrent → Incomplete
23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete
23 Oct 2026 · 08:31:50 UTC Source coverage: msrc-cvrfCurrent → Incomplete
22 Oct 2026 · 17:33:15 UTC EPSS1.2%; scored 21 Oct 2026 → 1.2%; scored 22 Oct 2026
21 Oct 2026 · 21:47:24 UTC EPSS1.2%; scored 20 Oct 2026 → 1.2%; scored 21 Oct 2026
20 Oct 2026 · 20:53:31 UTC EPSS1.2%; scored 19 Oct 2026 → 1.2%; scored 20 Oct 2026
19 Oct 2026 · 15:12:40 UTC EPSS1.2%; scored 18 Oct 2026 → 1.2%; scored 19 Oct 2026
18 Oct 2026 · 14:54:30 UTC EPSS1.2%; scored 16 Oct 2026 → 1.2%; scored 18 Oct 2026
18 Oct 2026 · 14:54:30 UTC Link: September 2026/security?release=2026-Sep#cves
16 Oct 2026 · 16:13:25 UTC EPSS1.2%; scored 15 Oct 2026 → 1.2%; scored 16 Oct 2026
15 Oct 2026 · 21:30:54 UTC EPSS1.2%; scored 14 Oct 2026 → 1.2%; scored 15 Oct 2026
15 Oct 2026 · 01:07:54 UTC EPSS1.2%; scored 13 Oct 2026 → 1.2%; scored 14 Oct 2026
14 Oct 2026 · 11:22:42 UTC Source coverage: msrc-cvrfIncomplete → Current