CVE-2021-37859
MEDIUMCVSS 6.1/10EPSS 3.29%
Last modified
CVE-2021-37859 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Fixed a bypass for a reflected cross-site scripting vulnerability affecting OAuth-enabled instances of Mattermost.. EPSS estimates a 3.29% chance of exploitation in the next 30 days.
Description
Fixed a bypass for a reflected cross-site scripting vulnerability affecting OAuth-enabled instances of Mattermost.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | >= 5.32.0, < 5.34.5 |
| Mattermost | Mattermost | >= 5.35.0, < 5.35.4 |
| Mattermost | Mattermost | >= 5.36.0, < 5.36.1 |
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-2021-37859?
Fixed a bypass for a reflected cross-site scripting vulnerability affecting OAuth-enabled instances of Mattermost.
How severe is CVE-2021-37859?
CVE-2021-37859 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 3.29% probability of exploitation in the next 30 days.
How do I fix CVE-2021-37859?
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.
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- CVE-2021-37860Mattermost 5.38 and earlier fails to sufficiently sanitize c…6.1
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Are you affected by CVE-2021-37859?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST