What’s Vulnerable › Vulnerabilities

CVE-2019-18933

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-11-21 · updated 2026-06-17

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.

Affected products

• zulip: from 1.7.0 before 2.0.7 — fixed in 2.0.7

How to fix

Upgrade to a fixed version: zulip 2.0.7. Check the vendor advisory for mitigations.

References

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

Get alerted when CVE-2019-18933 or the next vulnerability affects your stack