CVE-2018-21031 Auth bypass in n/a
Remote attackers can bypass access controls in Plex Media Server by retrieving the X-Plex-Token from vulnerable Tautulli instances.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2018-21031?
CVE-2018-21031 is a medium-severity authentication bypass vulnerability in n/a, published on 18 Nov 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Tautulli versions 2.1.38 and below allows remote attackers to bypass intended access control in Plex Media Server because the X-Plex-Token is mishandled and can be retrieved from Tautulli. NOTE: Initially, this id was associated with Plex Media Server 1.18.2.2029-36236cc4c as the affected product and version. Further research indicated that Tautulli is the correct affected product.
Weakness: CWE-522
Which versions are affected by CVE-2018-21031?
It affects 1 product.
Products include Plex Media Server.
How do I fix CVE-2018-21031?
No fix has been published for CVE-2018-21031 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-2018-21031 being exploited?
There is no known exploitation of CVE-2018-21031 in the wild and no public exploit code.
Other vulnerabilities in n/a
- CVE-2026-96656 Plex Media Server External Control of File Name or Path
- CVE-2020-5741 Plex Media Server Remote Code Execution
- CVE-2026-96654 Plex Media Server Improper Neutralization of Encoded URI Schemes in a Web Page
- CVE-2026-96652 Plex Media Server Server-Side Request Forgery (SSRF)
- CVE-2026-96655 Plex Media Server Server-Side Request Forgery (SSRF)
Sources
Also known as GHSA-9qh9-xp4m-mxph.