Risk | Medium |
Patch available | YES |
Number of vulnerabilities | 1 |
CVE-ID | CVE-2023-22735 |
CWE-ID | CWE-434 |
Exploitation vector | Network |
Public exploit | N/A |
Vulnerable software |
Zulip Server Web applications / Other software |
Vendor | Zulip |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
EUVDB-ID: #VU72011
Risk: Medium
CVSSv4.0: 1.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:U/U:Green]
CVE-ID: CVE-2023-22735
CWE-ID:
CWE-434 - Unrestricted Upload of File with Dangerous Type
Exploit availability: No
DescriptionThe vulnerability allows a remote user to perform XSS attacks.
The vulnerability exists due to application allows to upload files with arbitrary Content-Type. Such file will be served from the Zulip hostname with Content-Disposition: inline and no Content-Security-Policy header. A remote user can upload a malicious file and execute arbitrary Javascript in the victim's browser in security context of the website.
Install updates from vendor's website.
The vulnerability affects the main branch between 2023-01-09 and 2023-02-07.
Vulnerable software versionsZulip Server: 6.1
CPE2.3 External linkshttps://github.com/zulip/zulip/security/advisories/GHSA-wm83-3764-5wqh
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.