CVE-20XX-?

CVE-2026-8683

6.5 MEDIUM 0.2% exploit odds Fix listed Denial of service Server

What it is

Mattermost Desktop App versions <=6.1 5.5.13.0 fail to account for attempting to open extremely long URLs in the Mattermost Desktop App which allows a malicious server owner to crash the application via including a script to call window.open on a very large URL. Mattermost Advisory ID: MMSA-2026-00652

At a glance

Exploitability
Can be exploited over the network without logging in, but needs a user to act. High risk of service disruption.
Exploit odds
0.2% chance of exploitation in the next 30 days (EPSS).
Fix
A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

  1. PublishedDisclosed publicly on CVE.org and NVD
  2. Last updatedMost recent change to the record

Details

Published
Last modified
Exploit probability
0.2% · EPSS, next 30 days
Weakness
CWE-770 · Allocation without limits
Record status
Analyzed

Affected

Attack profile CVSS 3.1 · 6.5

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Meme: I wake up, CVE-2026-8683
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Fix and advisories

References

NVD record · CVE.org record