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Recorded 21 Oct 2026 at 21:47 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.

Skype for Business Spoofing Vulnerability

Improper neutralization of input during web page generation ('cross-site scripting') in Skype for Business allows an unauthorized attacker to perform spoofing over a network.

What it said

CVE
CVE-2026-63523
Severity
Important
CVSS base score
6.5
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
Impact
Spoofing
Exploitation detected
Not reported by MSRC
Publicly disclosed
No
Exploitability
Exploitation Less Likely
Component
Skype for Business
Weakness
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Issued by
Microsoft
Customer action
Required: apply the update
Affected products
Skype for Business Server 2015 CU13, Skype for Business Server 2019 CU8, Skype for Business Server Subscription Edition CU1
Updates that fix it
KB5123287: Skype for Business Server Subscription Edition CU1; KB5123300: Skype for Business Server 2019 CU8; KB5123301: Skype for Business Server 2015 CU13
CISA KEV
Not listed in the collected catalog
EPSS
0.6%; scored 21 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.

Source evidence when recorded

Microsoft security releases
Complete at observationRead 21 Oct 2026 at 21:46 UTC
CISA KEV
Complete at observationRead 21 Oct 2026 at 21:46 UTC
FIRST EPSS
Complete at observationRead 21 Oct 2026 at 21:46 UTC
Public detection templates (Nuclei)
Complete at observationRead 21 Oct 2026 at 21:46 UTC

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

Page history

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

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Field-level log (9)

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

  1. 21 Oct 2026 · 21:47:24 UTC EPSS0.6%; scored 20 Oct 2026 → 0.6%; scored 21 Oct 2026
  2. 20 Oct 2026 · 20:53:31 UTC EPSS0.6%; scored 19 Oct 2026 → 0.6%; scored 20 Oct 2026
  3. 19 Oct 2026 · 15:12:40 UTC EPSS0.6%; scored 18 Oct 2026 → 0.6%; scored 19 Oct 2026
  4. 18 Oct 2026 · 14:54:30 UTC EPSS0.6%; scored 16 Oct 2026 → 0.6%; scored 18 Oct 2026
  5. 18 Oct 2026 · 14:54:30 UTC Link: September 2026/security?release=2026-Sep#cves
  6. 16 Oct 2026 · 16:13:25 UTC EPSS0.6%; scored 15 Oct 2026 → 0.6%; scored 16 Oct 2026
  7. 15 Oct 2026 · 21:30:54 UTC EPSS0.6%; scored 14 Oct 2026 → 0.6%; scored 15 Oct 2026
  8. 15 Oct 2026 · 01:07:54 UTC EPSS0.6%; scored 13 Oct 2026 → 0.6%; scored 14 Oct 2026
  9. 14 Oct 2026 · 11:22:42 UTC Source coverage: msrc-cvrfIncomplete → Current
ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 11 Nov 02:38 UTC · 275 of 275 readable · 273 fully read · documentation 467/469 current