# CVE-2022-26910: Skype for Business and Lync Spoofing Vulnerability

> Attackers can spoof identities in Skype for Business and Lync, bypassing security controls and misleading users.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Apr 2022
- **Updated:** 2 Jan 2025
- **Also known as:** GHSA-gq3f-cc5w-p8w5

## What is CVE-2022-26910?

CVE-2022-26910 is a medium-severity vulnerability in Microsoft Skype for Business Server 2015 CU12, published on 15 Apr 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Skype for Business and Lync Spoofing Vulnerability

Weakness: CWE-290 (Authentication Bypass by Spoofing)

## Which versions are affected by CVE-2022-26910?

It affects 1 product.


Products: Microsoft Skype for Business Server.

## How do I fix CVE-2022-26910?

No fix has been published for CVE-2022-26910 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-26910 being exploited?

There is no known exploitation of CVE-2022-26910 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Skype for Business Server 2015 CU12

- [CVE-2023-41763](https://insights.sbomify.com/CVE-2023-41763/): Microsoft Skype for Business Privilege Escalation (medium 5.3, exploited in the wild)
- [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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-26910 and fix it if it is affected.

What it is: CVE-2022-26910 is a medium-severity vulnerability in Microsoft Skype for Business Server 2015 CU12, published on 15 Apr 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-26910 in the wild and no public exploit code.

Affected product: Microsoft Skype for Business Server 2015 CU12. 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-2022-26910/ (Markdown: https://insights.sbomify.com/CVE-2022-26910/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-26910
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-26910
- OSV: https://osv.dev/vulnerability/CVE-2022-26910

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-26910/
Summaries are generated and may contain mistakes; the official description above is the record.