CVE-2018-9986
In Zulip Server versions before 1.7.2, there were XSS issues with the frontend markdown processor.
In Zulip Server versions before 1.7.2, there were XSS issues with the frontend markdown processor.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
In Zulip Server versions before 1.7.2, there were XSS issues with the frontend markdown processor.
- Record
CVE-2018-9986- CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE List No score
In Zulip Server versions before 1.7.2, there were XSS issues with the frontend markdown processor.
- Record
CVE-2018-9986- Updated
- 2026-11-02
EUVDEUVD-2018-21578 No score
In Zulip Server versions before 1.7.2, there were XSS issues with the frontend markdown processor.
- Record
EUVD-2018-21578- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-m68q-4gqq-2h33
In Zulip Server versions before 1.7.2, there were XSS issues with the frontend markdown processor.
In Zulip Server versions before 1.7.2, there were XSS issues with the frontend markdown processor.
- Record
GHSA-m68q-4gqq-2h33- CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
In Zulip Server versions before 1.7.2, there were XSS issues with the frontend markdown processor.
- Record
CVE-2018-9986- CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2018-9986 is a medium vulnerability (CVSS 6.1) in Zulip Server, published April 18, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.81%, the 57th percentile. No source names a fixed version.