# CVE-2023-41763: Microsoft Skype for Business Privilege Escalation

> An attacker can exploit Server-Side Request Forgery in Skype for Business Server to escalate privileges and access sensitive data.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C`)
- **Exploited in the wild:** Yes, since 10 Oct 2023 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Oct 2023
- **Updated:** 21 Oct 2025
- **Also known as:** GHSA-7997-4r78-h34m

## What is CVE-2023-41763?

CVE-2023-41763 is a medium-severity server-side request forgery vulnerability in Microsoft Skype for Business Server 2015 CU13, published on 10 Oct 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Skype for Business Elevation of Privilege Vulnerability

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2023-41763?

It affects 1 product.


Products: Microsoft Skype for Business Server.

## How do I fix CVE-2023-41763?

No fix has been published for CVE-2023-41763 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 31 Oct 2023.

## Is CVE-2023-41763 being exploited?

Yes. Attackers have exploited CVE-2023-41763 in the wild since at least 10 Oct 2023.

Public exploit code:

- Skype for Business 2019 (SfB) - Blind Server-side Request Forgery (nuclei): http/cves/2023/CVE-2023-41763.yaml

## Other vulnerabilities in Microsoft Skype for Business Server 2015 CU13

- [CVE-2026-66302](https://insights.sbomify.com/CVE-2026-66302/): Skype for Business Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2026-69646](https://insights.sbomify.com/CVE-2026-69646/): Skype for Business Spoofing Vulnerability (high 8.3)
- [CVE-2026-66304](https://insights.sbomify.com/CVE-2026-66304/): Skype for Business Information Disclosure Vulnerability (high 7.5)
- [CVE-2026-66307](https://insights.sbomify.com/CVE-2026-66307/): Skype for Business and Lync Denial of Service Vulnerability (high 7.5)
- [CVE-2023-36780](https://insights.sbomify.com/CVE-2023-36780/): Skype for Business Remote Code Execution Vulnerability (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-41763 and fix it if it is affected.

What it is: CVE-2023-41763 is a medium-severity server-side request forgery vulnerability in Microsoft Skype for Business Server 2015 CU13, published on 10 Oct 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2023-41763 in the wild since at least 10 Oct 2023.

Affected product: Microsoft Skype for Business Server 2015 CU13. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2023-41763/ (Markdown: https://insights.sbomify.com/CVE-2023-41763/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-41763
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-41763
- OSV: https://osv.dev/vulnerability/CVE-2023-41763

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-41763/
Summaries are generated and may contain mistakes; the official description above is the record.