Path traversal in Zulip Server - CVE-2026-26058
Published: April 1, 2026
Vulnerability identifier: #VU124765
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-26058
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Zulip
Affected software:
Zulip Server
Zulip Server
Detailed vulnerability description
The vulnerability allows a remote attacker to perform directory traversal attacks.
The vulnerability exists due to input validation error when processing directory traversal sequences in uploads/records.json. A remote attacker can send a specially crafted HTTP request and read arbitrary files on the system.
How to mitigate CVE-2026-26058
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.