Vulnerability Details CVE-2021-43791
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 41.0%
CVSS Severity
CVSS v3 Score 6.5
CVSS v2 Score 5.0
References
Products affected by CVE-2021-43791
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cpe:2.3:a:zulip:zulip:-
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cpe:2.3:a:zulip:zulip:0.7.1
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cpe:2.3:a:zulip:zulip:1.0.11
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cpe:2.3:a:zulip:zulip:1.0.12
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cpe:2.3:a:zulip:zulip:1.0.13
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cpe:2.3:a:zulip:zulip:1.0.14
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cpe:2.3:a:zulip:zulip:1.0.15
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cpe:2.3:a:zulip:zulip:1.0.16
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cpe:2.3:a:zulip:zulip:1.0.17
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cpe:2.3:a:zulip:zulip:1.0.18
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cpe:2.3:a:zulip:zulip:1.0.19
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cpe:2.3:a:zulip:zulip:1.0.20
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cpe:2.3:a:zulip:zulip:1.0.21
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cpe:2.3:a:zulip:zulip:1.0.22
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cpe:2.3:a:zulip:zulip:1.0.24
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cpe:2.3:a:zulip:zulip:1.0.25
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cpe:2.3:a:zulip:zulip:1.0.26
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cpe:2.3:a:zulip:zulip:1.0.27
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cpe:2.3:a:zulip:zulip:1.0.29
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cpe:2.3:a:zulip:zulip:1.3.0
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cpe:2.3:a:zulip:zulip:1.3.1
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cpe:2.3:a:zulip:zulip:1.3.10
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cpe:2.3:a:zulip:zulip:1.3.11
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cpe:2.3:a:zulip:zulip:1.3.12
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cpe:2.3:a:zulip:zulip:1.3.13
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cpe:2.3:a:zulip:zulip:1.3.2
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cpe:2.3:a:zulip:zulip:1.3.3
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cpe:2.3:a:zulip:zulip:1.3.4
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cpe:2.3:a:zulip:zulip:1.3.5
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cpe:2.3:a:zulip:zulip:1.3.6
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cpe:2.3:a:zulip:zulip:1.3.7
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cpe:2.3:a:zulip:zulip:1.3.8
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cpe:2.3:a:zulip:zulip:1.3.9
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cpe:2.3:a:zulip:zulip:1.4.0
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cpe:2.3:a:zulip:zulip:1.4.1
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cpe:2.3:a:zulip:zulip:1.4.2
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cpe:2.3:a:zulip:zulip:1.4.3
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cpe:2.3:a:zulip:zulip:1.5.0
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cpe:2.3:a:zulip:zulip:1.5.1
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cpe:2.3:a:zulip:zulip:1.5.2
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cpe:2.3:a:zulip:zulip:1.6.0
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cpe:2.3:a:zulip:zulip:1.7.0
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cpe:2.3:a:zulip:zulip:1.7.1
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cpe:2.3:a:zulip:zulip:1.7.2
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cpe:2.3:a:zulip:zulip:1.8.0
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cpe:2.3:a:zulip:zulip:1.8.1
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cpe:2.3:a:zulip:zulip:1.9.0
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cpe:2.3:a:zulip:zulip:1.9.1
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cpe:2.3:a:zulip:zulip:1.9.2
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cpe:2.3:a:zulip:zulip:2.0.0
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cpe:2.3:a:zulip:zulip:2.0.1
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cpe:2.3:a:zulip:zulip:2.0.2
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cpe:2.3:a:zulip:zulip:2.0.3
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cpe:2.3:a:zulip:zulip:2.0.4
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cpe:2.3:a:zulip:zulip:2.0.5
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cpe:2.3:a:zulip:zulip:2.0.6
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cpe:2.3:a:zulip:zulip:2.0.7
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cpe:2.3:a:zulip:zulip:2.0.8
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cpe:2.3:a:zulip:zulip:2.1.0
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cpe:2.3:a:zulip:zulip:2.1.1
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cpe:2.3:a:zulip:zulip:2.1.2
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cpe:2.3:a:zulip:zulip:2.1.3
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cpe:2.3:a:zulip:zulip:2.1.33
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cpe:2.3:a:zulip:zulip:2.1.4
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cpe:2.3:a:zulip:zulip:2.1.5
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cpe:2.3:a:zulip:zulip:2.1.6
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cpe:2.3:a:zulip:zulip:2.1.7
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cpe:2.3:a:zulip:zulip:2.1.8
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cpe:2.3:a:zulip:zulip:2.2
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cpe:2.3:a:zulip:zulip:2.3.35
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cpe:2.3:a:zulip:zulip:2.7.39
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cpe:2.3:a:zulip:zulip:3.0
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cpe:2.3:a:zulip:zulip:3.0.40
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cpe:2.3:a:zulip:zulip:3.1
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cpe:2.3:a:zulip:zulip:3.1.41
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cpe:2.3:a:zulip:zulip:3.2
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cpe:2.3:a:zulip:zulip:3.2.42
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cpe:2.3:a:zulip:zulip:3.3
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cpe:2.3:a:zulip:zulip:3.3.43
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cpe:2.3:a:zulip:zulip:3.4
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cpe:2.3:a:zulip:zulip:4.0
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cpe:2.3:a:zulip:zulip:4.1
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cpe:2.3:a:zulip:zulip:4.2
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cpe:2.3:a:zulip:zulip:4.3
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cpe:2.3:a:zulip:zulip:4.4
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cpe:2.3:a:zulip:zulip:4.5
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cpe:2.3:a:zulip:zulip:4.6
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cpe:2.3:a:zulip:zulip:4.7