CVE-2021-26253 Bypass of Splunk Enterprise's implementation of DUO MFA
Attackers can bypass DUO MFA verification in Splunk Enterprise instances configured to use this feature, potentially gaining unauthorized access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-26253?
CVE-2021-26253 is a high-severity authentication bypass vulnerability in Splunk Splunk, published on 6 May 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A potential vulnerability in Splunk Enterprise's implementation of DUO MFA allows for bypassing the MFA verification in Splunk Enterprise versions before 8.1.6. The potential vulnerability impacts Splunk Enterprise instances configured to use DUO MFA and does not impact or affect a DUO product or service.
Weakness: CWE-287
Which versions are affected by CVE-2021-26253?
It affects 1 product.
Products include Splunk Splunk.
How do I fix CVE-2021-26253?
No fix has been published for CVE-2021-26253 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2021-26253 being exploited?
There is no known exploitation of CVE-2021-26253 in the wild and no public exploit code.
Other vulnerabilities in Splunk Splunk
- CVE-2026-20253 Splunk Enterprise Missing Authentication for Critical Function
- CVE-2026-76268 Missing Authentication for Critical Function in the Patroni REST API in Splunk Enterprise
- CVE-2026-76284 Improper Neutralization in Splunk Enterprise
- CVE-2026-76285 Improper Adherence to Coding Standards in Splunk Enterprise
- CVE-2017-17067 Auth bypass in n/a
Sources
Also known as GHSA-2393-5754-m287.