CVE-2017-18913 Cross-site scripting in n/a
Cross-site scripting vulnerability in Mattermost Server allows attackers to execute arbitrary scripts via a link on an error page.
- 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-2017-18913?
CVE-2017-18913 is a medium-severity cross-site scripting vulnerability in Mattermost Mattermost Server, published on 19 Jun 2020. 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
An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. XSS can occur via a link on an error page.
Weakness: CWE-79
Which versions are affected by CVE-2017-18913?
It affects 1 product.
Products include Mattermost Mattermost Server.
How do I fix CVE-2017-18913?
No fix has been published for CVE-2017-18913 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2017-18913 being exploited?
There is no known exploitation of CVE-2017-18913 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-4g54-g63j-qr8v.