CVE-2021-30479 Missing authorization in n/a
Guest users can access private message traffic in public streams due to a bug in the all_public_streams API feature.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-30479?
CVE-2021-30479 is a medium-severity missing authorization vulnerability in n/a, published on 14 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in Zulip Server before 3.4. A bug in the implementation of the all_public_streams API feature resulted in guest users being able to receive message traffic to public streams that should have been only accessible to members of the organization.
Weakness: CWE-269
Which versions are affected by CVE-2021-30479?
It affects 1 product.
Products include Zulip Zulip Server.
How do I fix CVE-2021-30479?
No fix has been published for CVE-2021-30479 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2021-30479 being exploited?
There is no known exploitation of CVE-2021-30479 in the wild and no public exploit code.
Other vulnerabilities in n/a
- CVE-2019-18933 Information disclosure in n/a
- CVE-2020-15070 Code injection in n/a
- CVE-2017-0910 Missing authorization in Zulip Server
- CVE-2025-31478 Zulip Authentication Backend Configuration Bypass
- CVE-2023-33186 Cross-site scripting vulnerability in Zulip Server development branch via topic tooltip
Sources
Also known as GHSA-r3hv-m3j5-mrfp.