CVE-2020-9444
Zulip Server before 2.1.3 allows reverse tabnabbing via the Markdown functionality.
Zulip Server before 2.1.3 allows reverse tabnabbing via the Markdown functionality.
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
Zulip Server before 2.1.3 allows reverse tabnabbing via the Markdown functionality.
- Record
CVE-2020-9444- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 5.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:N - Weakness
- CWE-1021
- Updated
- 2026-11-02
CVE List No score
Zulip Server before 2.1.3 allows reverse tabnabbing via the Markdown functionality.
- Record
CVE-2020-9444- Updated
- 2026-11-02
EUVDEUVD-2020-30264 No score
Zulip Server before 2.1.3 allows reverse tabnabbing via the Markdown functionality.
- Record
EUVD-2020-30264- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-gq6q-gh85-7w3x No score
Zulip Server before 2.1.3 allows reverse tabnabbing via the Markdown functionality.
Zulip Server before 2.1.3 allows reverse tabnabbing via the Markdown functionality.
- Record
GHSA-gq6q-gh85-7w3x- Updated
- 2026-11-02
OSV
Zulip Server before 2.1.3 allows reverse tabnabbing via the Markdown functionality.
- Record
CVE-2020-9444- CVSS 3.1
- 6.1 Medium
CVSS:3.1/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 |
|---|---|---|
| facts | ||
| 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-2020-9444 is a medium vulnerability (CVSS 6.1) in Zulip Server, published April 20, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.67%, the 52nd percentile. No source names a fixed version.