CVE-2023-41763
MediumExploitedPublic exploitSkype for Business Elevation of Privilege Vulnerability
Published Oct 10, 2023 · Updated Oct 28, 2025
Key Facts
Patch immediately- CVE-2023-41763 is a medium-severity vulnerability (CVSS 5.3 v3.1) affecting Skype For Business Server (Microsoft), Skype for Business Server 2015 CU13, Skype for Business Server 2019 CU7.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 10, 2023. Public exploit code is available.
- EPSS estimates a 91% probability of exploitation in the next 30 days.
- Fixed versions are available, including Skype for Business Server 2015 CU13 6.0.9319.869, Skype for Business Server 2019 CU7 7.0.246.530.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS (30-day exploit likelihood)
91%
Higher than 99.8% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2023-41763 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Skype for Business Elevation of Privilege Vulnerability
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Oct 10, 2023 | Oct 31, 2023 | Not reported |
| Industry KEV feed | Oct 10, 2023 | Oct 31, 2023 | Not reported |
| CIRCL KEV | Oct 10, 2023 | Oct 31, 2023 | Not reported |
| ENISA EUVD | Oct 10, 2023 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Skype For Business ServerMicrosoft | 2015-cumulative_update_13, 2019-cumulative_update_7 | n/a |
| Skype for Business Server 2015 CU13 | >= 9319.0 | 6.0.9319.869 |
| Skype for Business Server 2019 CU7 | >= 2046.0 | 7.0.246.530 |
Patched Releases
Skype for Business Server 2015 CU13
6.0.9319.869
Skype for Business Server 2019 CU7
7.0.246.530
Timeline
Publicly disclosed
Oct 10, 2023
Added to CISA KEV
Oct 10, 2023
Added to Industry KEV feed
Oct 10, 2023
Added to CIRCL KEV
Oct 10, 2023
Added to ENISA EUVD
Oct 10, 2023
Last updated
Oct 28, 2025
Weakness Type
- CWE-918 Server-Side Request Forgery (SSRF)
References
- patchSkype for Business Elevation of Privilege Vulnerability
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
Skype for Business Elevation of Privilege Vulnerability
Affected: Skype For Business Server (Microsoft) versions 2015-cumulative_update_13, 2019-cumulative_update_7; Skype for Business Server 2015 CU13 versions >= 9319.0; Skype for Business Server 2019 CU7 versions >= 2046.0. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 10, 2023.
Yes. It was added on Oct 10, 2023 with a federal remediation due date of Oct 31, 2023.
Public exploit code is available.
Fixed versions are available, including Skype for Business Server 2015 CU13 6.0.9319.869, Skype for Business Server 2019 CU7 7.0.246.530.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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