CVE-2018-3761 Auth bypass in Nextcloud Server
Improper authentication in the OAuth2 token endpoint allows attackers to obtain new tokens if the client is partially compromised.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2018-3761?
CVE-2018-3761 is a high-severity authentication bypass vulnerability in Nextcloud Nextcloud Server, published on 5 Jul 2018. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Nextcloud Server before 12.0.8 and 13.0.3 suffer from improper authentication on the OAuth2 token endpoint. Missing checks potentially allowed handing out new tokens in case the OAuth2 client was partly compromised.
Weakness: CWE-287
Which versions are affected by CVE-2018-3761?
It affects 1 product.
Products include Nextcloud Nextcloud Server.
How do I fix CVE-2018-3761?
No fix has been published for CVE-2018-3761 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-2018-3761 being exploited?
There is no known exploitation of CVE-2018-3761 in the wild and no public exploit code.
Other vulnerabilities in Nextcloud Nextcloud Server
- CVE-2021-32802 Preview generation used third-party library not suited for user-generated content in Nextcloud server
- CVE-2023-26482 Scope of workflow operations is not validated in nextcloud server
- CVE-2018-3775 Auth bypass in Nextcloud Server
- CVE-2023-35172 Nextcloud Server password reset endpoint is not brute force protected
- CVE-2023-32320 Nextcloud Server's brute force protection allows someone to send more requests than intended
Sources
Also known as GHSA-frc3-rhfw-jxf5.