CVE-2020-9444

Home/CVE/Zulip Server before 2.1.3 allows reverse tabnabbing via the Markdown functionality.

CVE

Zulip Server before 2.1.3 allows reverse tabnabbing via the Markdown functionality.

MEDIUM · CVSS 6.1 EPSS 0.00197

Monitor

No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence

Sigma rules0 YARA rules0

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Weakness Classification

CWE-1021Improper Restriction of Rendered UI Layers or Frames

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Affected Products & Versions

zulip server<= 2.1.3

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Scoring & Timeline

6.1

MEDIUM · CVSS v3.1 · cve@mitre.org

View on NVD

Attack Vector

Network Adjacent Local Physical

Attack Complexity

Low High

Privileges Required

None Low High

User Interaction

None Required

Scope

Unchanged Changed

Confidentiality

None Low High

Integrity

None Low High

Availability

None Low High

Published to NVD20 Apr 2020 · 08:15 PM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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References & Sources

Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.

https://blog.zulip.org/2020/04/01/zulip-server-2-1-3-security-release/Vendor Advisory

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External lookups - second-class, for what we don’t hold ourselves

NVD CVE.org CISA Vulners Exploit-DB GitHub PoC VulnCheck KEV GreyNoise

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Detection & defense
Sigma rules
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Compliance
NIST 800-53
ISO 27001:2022
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PCI-DSS v4.0
CIS Controls v8.1

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