CVE-2016-11081 Mattermost Server exposes information stored by a web browser
Mattermost Server allows unintended access to browser-stored information, potentially exposing sensitive data to attackers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2016-11081?
CVE-2016-11081 is a medium-severity vulnerability in Mattermost Mattermost Server, published on 19 Jun 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An issue was discovered in Mattermost Server before 2.2.0. It allows unintended access to information stored by a web browser.
Weakness: CWE-200
Which versions are affected by CVE-2016-11081?
3 open source packages ship an affected version, including github.com/mattermost/mattermost-server. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/mattermost/mattermost-server Go | All versions | 2.2.0 |
github.com/mattermost/mattermost-server Go | All versions | 2.2.0 |
github.com/mattermost/mattermost-server Go | All versions | 2.2.0+incompatible |
Products include Mattermost Mattermost Server.
How do I fix CVE-2016-11081?
Upgrade github.com/mattermost/mattermost-server to a fixed version for your release line: 2.2.0 or 2.2.0+incompatible.
Is CVE-2016-11081 being exploited?
There is no known exploitation of CVE-2016-11081 in the wild and no public exploit code.
Other vulnerabilities in Mattermost Mattermost Server
- CVE-2025-12419 Account takeover on OAuth/OpenID-enabled servers
- CVE-2025-12421 Account Takeover via Code Exchange Endpoint
- CVE-2025-4981 Path Traversal Leading to RCE by Any Authenticated Mattermost User
- CVE-2025-20051 Arbitrary file read via block duplication in Mattermost Boards
- CVE-2025-25279 Arbitrary file read in Mattermost Boards via import & export board archive
Sources
Also known as GHSA-5q37-9874-qxcw, GO-2025-4062.