CVE-2022-26910
Published: 15 April 2022
Summary
CVE-2022-26910 is a medium-severity Authentication Bypass by Spoofing (CWE-290) vulnerability in Microsoft Skype For Business Server. Its CVSS base score is 5.3 (Medium).
Operationally, ranked in the top 26.6% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2022-26910 is a spoofing vulnerability affecting Skype for Business and Lync, assigned CWE-290 for authentication bypass by spoofing. It carries a CVSS 3.1 base score of 5.3 reflecting network attack vector, low complexity, no required privileges or user interaction, and partial impact to confidentiality.
An unauthenticated attacker can exploit the flaw remotely to spoof identities and obtain limited information that would otherwise be protected, bypassing intended authentication checks in the affected communication products.
The primary advisory reference is the Microsoft Security Response Center entry at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-26910, which practitioners should consult for official patch availability and mitigation guidance.
EPSS for this CVE rose materially from a low baseline to a peak of 0.0553 on 2025-01-22 before receding to the current value of 0.0074, indicating that exploitation interest emerged after disclosure and that the issue warrants renewed attention.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2022-31456
Vulnerability details
Skype for Business and Lync Spoofing Vulnerability
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Reveals spoofed logon attempts through unexpected previous logon timestamps upon legitimate login.
Training specifically addresses recognizing spoofed communications and phishing that enable authentication bypass.
Requiring verifiable identity evidence at appropriate assurance levels makes it substantially harder for attackers to successfully spoof or impersonate users to obtain accounts.
Unique device authentication makes successful spoofing of device identity substantially more difficult to achieve.
Unique identification of non-organizational users reduces the feasibility of authentication bypass by spoofing.
Unique identification and authentication of services before communications makes spoofing of service identities substantially harder.
Isolated trusted path ensures the user interacts only with genuine system components, preventing spoofing of authentication interfaces or prompts.
Directly counters DNS response spoofing by requiring cryptographic origin authentication artifacts from the authoritative source.