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CVE-2019-18933

30
FAUCET Score

CVE-2019-18933 describes a critical vulnerability in Zulip Server versions 1.7.0 to before 2.0.7, where a flaw in the new user signup process allowed unprivileged attackers to steal the personal API key of users who registered via social authentication in organizations also permitting password authentication. This vulnerability carries a CVSS score of 9.8 (CRITICAL) due to its network-based attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability, granting nearly full account access. While there is no known active exploitation, public exploit code, or KEV listing, the vulnerability has garnered significant community discussion with 10 mentions, indicating awareness despite a lack of media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.7.0, < 2.0.7CPE matchmatch criteria
cpe:2.3:a:zulip:zulip_server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.35%
Probability of exploitation in next 30 days
EPSS Percentile
68.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0135 is in the 55th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

blog.zulip.org / 2019/11/21/zulip-2-0-7-security-release
Vendor Advisory
github.com / zulip/zulip/commit/0c2cc41d2e40807baa5ee2c72987ebfb64ea2eb6
Patch