Medium severity · published Jan 20, 2022
CVE-2021-3866
Cross-site Scripting (XSS) - Stored in zulip/zulip
5.4
CVSS
0.9%
EPSS
No
On KEV
Description
Cross-site Scripting (XSS) - Stored in GitHub repository zulip/zulip more than and including 44f935695d452cc3fb16845a0c6af710438b153d and prior to 3eb2791c3e9695f7d37ffe84e0c2184fae665cb6.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 59% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ZU
zulip/zulip · zulip
44f935695d452cc3fb16845a0c6af710438b153d before unspecified; before 3eb2791c3e9695f7d37ffe84e0c2184fae665cb6 · source: vendor
ZU
Zulip · Zulip
through 4.8 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3866
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-3866
Vendor Advisory
https://blog.zulip.com/2022/01/19/cve-2021-3866/
Patch
https://github.com/zulip/zulip/commit/3eb2791c3e9695f7d37ffe84e0c2184fae665cb6
Exploit
https://huntr.dev/bounties/5f48dac5-e112-4b23-bbbf-cc00ba83bcf2
More from zulip/zulip
8.8
CVE-2021-3967
Improper Access Control in zulip/zulip