HOMEVULNERABILITIESCVE-2019-18933
CRITICAL

CVE-2019-18933

NVD-CWE-noinfoPublished: November 21, 2019· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

In Zulip Server versions from 1.7.0 to before 2.0.7, a bug in the new user signup process meant that users who registered their account using social authentication (e.g., GitHub or Google SSO) in an organization that also allows password authentication could have their personal API key stolen by an unprivileged attacker, allowing nearly full access to the user's account.

NVD Source

Technical Analysis

CVE-2019-18933 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

zulip1 product(s)
zulip server
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://github.com/zulip/zulip/commit/0c2cc41d2e40807baa5ee2c72987ebfb64ea2eb6
PATCHhttps://github.com/zulip/zulip/commit/0c2cc41d2e40807baa5ee2c72987ebfb64ea2eb6
ADVISORYhttps://blog.zulip.org/2019/11/21/zulip-2-0-7-security-release/
ADVISORYhttps://blog.zulip.org/2019/11/21/zulip-2-0-7-security-release/

All References (4)

→
https://blog.zulip.org/2019/11/21/zulip-2-0-7-security-release/Vendor Advisory
→
https://github.com/zulip/zulip/commit/0c2cc41d2e40807baa5ee2c72987ebfb64ea2eb6Patch
→
https://blog.zulip.org/2019/11/21/zulip-2-0-7-security-release/Vendor Advisory
→
https://github.com/zulip/zulip/commit/0c2cc41d2e40807baa5ee2c72987ebfb64ea2eb6Patch

Quick Facts

CVE IDCVE-2019-18933
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected1 vendor(s)
PublishedNov 21, 2019

Related CVEs (NVD-CWE-noinfo)

CVE-2008-6158
10.0
CVE-2006-3698
10.0
CVE-2022-37968
10.0
CVE-2009-1443
10.0
CVE-2015-6787
10.0
CVE-2012-3859
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-18933 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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