CVE-2026-6517Disclosure(mattermost / mattermost_desktop)
LOWCVSS 7.7 · HIGHSignal is active with 1 mentions in latest observed window
Immediate actions
- Track advisory updates for patch or workaround availability
Recommended action window: Monitor and triage in normal cycle
NVD description
Mattermost Desktop App versions <=6.1 5.5.13.0 fail to restrict the allow list of domains to which NTLM credentials were forwarded to in the Mattermost Desktop App which allows any user on a server without the image proxy enabled to intercept other users credentials via embedding an image that routes to an external web server. Mattermost Advisory ID: MMSA-2026-00651
0.0/ 10 priority
Sources & remediation
Vendor / third-party advisories
Weakness type (CWE)
CWE-522
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
Are you affected?
If you run products in this scope, you should treat this CVE as relevant to your environment.
- mattermost_desktop
Threat summary
- 1 mentions across 1 observed day
What's happening
- Technical details provided in 1 signal
- Disclosure: 1 classified signal
- 1 total mentions across 1 day
Affected systems
Vendors
Products
mattermost_desktop
Deep dive
Activity timeline1 mentions / 1d
Signal classification1 categories
Disclosure1100.0%
Referenced assets1 URL
CPE platform detail2 entries
2 of 2 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | mattermost | mattermost_desktop | - | - | - |
| App | mattermost | mattermost_desktop | - | - | - |