Vulnerability in Zulip Server
CVE-2021-30477
An issue was discovered in Zulip Server before 3.4. A bug in the implementation of replies to messages sent by outgoing webhooks to private streams meant that an outgoing webhook bot could be used to send messages to private streams that the user was not intended to be able to send messages to.
EPSS: 0.007 (47.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Zulip Zulip_server
- N/a — versions n/a
Public proof-of-concept exploits
References
- cve@mitre.org (x_refsource_MISC, Release Notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-30477?
- CVE-2021-30477 is a medium-severity vulnerability in Zulip Server. CVSS score: 4.3/10. Published 2021-04-15.
- How severe is CVE-2021-30477?
- Medium severity. CVSS v3 base score is 4.3 out of 10.
- Is CVE-2021-30477 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.