CVE-2017-18920
CRITICALCVSS 9.8/10EPSS 1.24%
Last modified
CVE-2017-18920 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in Mattermost Server before 3.6.2. The WebSocket feature does not follow the Same Origin Policy.. EPSS estimates a 1.24% chance of exploitation in the next 30 days.
Description
An issue was discovered in Mattermost Server before 3.6.2. The WebSocket feature does not follow the Same Origin Policy.
Metrics
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost Server | < 3.6.2 |
References
- https://mattermost.com/security-updates/Vendor Advisory
- https://mattermost.com/security-updates/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2017-18920?
An issue was discovered in Mattermost Server before 3.6.2. The WebSocket feature does not follow the Same Origin Policy.
How severe is CVE-2017-18920?
CVE-2017-18920 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.24% probability of exploitation in the next 30 days.
How do I fix CVE-2017-18920?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2017
- CVE-2017-18915An issue was discovered in Mattermost Server before 3.8.2, 3…9.8
- CVE-2017-18916An issue was discovered in Mattermost Server before 3.8.2, 3…5.3
- CVE-2017-18917An issue was discovered in Mattermost Server before 3.8.2, 3…7.5
- CVE-2017-18918An issue was discovered in Mattermost Server before 3.7.3 an…4.9
- CVE-2017-18919An issue was discovered in Mattermost Server before 3.7.0 an…5.3
- CVE-2017-1892Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultI…
- CVE-2017-18921An issue was discovered in Mattermost Server before 3.6.0 an…6.1
- CVE-2017-18922It was discovered that websockets.c in LibVNCServer prior to…9.8
- CVE-2017-18923beroNet VoIP Gateways before 3.0.16 have a PHP script that a…7.5
- CVE-2017-18924oauth2-server (aka node-oauth2-server) through 3.1.1 impleme…7.5
- CVE-2017-18925opentmpfiles through 0.3.1 allows local users to take owners…5.5
- CVE-2017-18926raptor_xml_writer_start_element_common in raptor_xml_writer.…7.1
Are you affected by CVE-2017-18920?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST