Open redirect in otp - CVE-2026-48856
Published: July 2, 2026
Vulnerability identifier: #VU136820
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-48856
CWE-ID: CWE-601
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: erlang
Affected software:
otp
otp
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to improper access control in the httpc redirect handler in httpc_response.erl when processing cross-origin redirects. A remote attacker can cause a server contacted by the victim to return a crafted redirect to disclose sensitive information.
By default, automatic redirects are enabled. The issue affects both the Authorization and proxy-authorization headers, including Basic credentials derived from URL userinfo.
How to mitigate CVE-2026-48856
Install security update from vendor's website.