CVE Tools
Track your stack

CVE-2026-66304

Skype for Business Information Disclosure Vulnerability

No known exploitation. EPSS puts it in the 62nd percentile. Fixed versions are out.

CVSS 3.17.5HighEPSS percentile62nd1.0% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix3 products3 fixed builds listed below
Check it yourself

No ready-made check. Neither Nuclei nor OpenVAS has one for this CVE yet.

Request a scan

Published Updated Sources: CVE.org, NVD

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • Microsoft Skype for Business Server 2015 CU13Affected: ≥ 9319.0, < 6.0.9319.885Upgrade to: 6.0.9319.885Stated by: CVE record
  • Microsoft Skype for Business Server 2019 CU8Affected: ≥ 2046.0, < 7.0.2046.569Upgrade to: 7.0.2046.569Stated by: CVE record
  • Microsoft Skype for Business Server Subscription Edition CU1Affected: ≥ 2046.0, < 7.0.2046.879Upgrade to: 7.0.2046.879Stated by: CVE record

Versions as the sources state them. Full version matrix after sign-in

Is your organisation exposed?Request an assessment to establish which checks fit your systems.

What it is

From the CVE record

Server-side request forgery (ssrf) in Skype for Business allows an unauthorized attacker to disclose information over a network.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS62nd
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

1.0% chance of exploitation activity in the next 30 days, which ranks it in the 62nd percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

7 events over 8 days, from the signal feeds we watch.

  1. Patch availablerecord updated
  2. Publishedweakness classified, att&ck mapped, record updated, record updated

Affected products

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Scored 7.5 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity NoneNo integrity impact
  • Availability NoneNo availability impact

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

In the news

Watch the software you run.

My Stack ranks new CVEs for your products by real-world exploitation, so the next serious one reaches you without reading every advisory.

We'll flag the next CVE, public exploit or patch for Microsoft, not every advisory.