CVE-2021-30477

Description

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.

4.3

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.23%

Vendor Advisory zulip.com

Affected: n/a n/a

References

Link	Tags
https://blog.zulip.com/2021/04/14/zulip-server-3-4/	release notes vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-30477?: CVE-2021-30477 has been scored as a medium severity vulnerability.
How to fix CVE-2021-30477?: To fix CVE-2021-30477, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-30477 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-30477 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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