CVE-2021-43791
Zulip is an open source group chat application that combines real-time chat with threaded conversations.
Does this matter?
Lower severity and a low EPSS score (0.64%). Track it; it rarely justifies an emergency change on its own.
Description
Zulip is an open source group chat application that combines real-time chat with threaded conversations. In affected versions expiration dates on the confirmation objects associated with email invitations were not enforced properly in the new account registration flow. A confirmation link takes a user to the check_prereg_key_and_redirect endpoint, before getting redirected to POST to /accounts/register/. The problem was that validation was happening in the check_prereg_key_and_redirect part and not in /accounts/register/ - meaning that one could submit an expired confirmation key and be able to register. The issue is fixed in Zulip 4.8. There are no known workarounds and users are advised to upgrade as soon as possible.
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- EPSS
- 0.64% probability · 49th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-613
- Affected
- zulip/zulip
- Source
- security-advisories@github.com
References
- https://github.com/zulip/zulip/commit/a014ef75a3a0ed7f24ebb157632ba58751e732c6Patch, Third Party Advisory
- https://github.com/zulip/zulip/security/advisories/GHSA-wj76-pcqr-mf9fThird Party Advisory
- https://github.com/zulip/zulip/commit/a014ef75a3a0ed7f24ebb157632ba58751e732c6Patch, Third Party Advisory
- https://github.com/zulip/zulip/security/advisories/GHSA-wj76-pcqr-mf9fThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.