CVE-2018-5702 Auth bypass in n/a

What is CVE-2018-5702?

CVE-2018-5702 is a high-severity authentication bypass vulnerability in Debian Debian Linux, published on 15 Jan 2018. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Transmission through 2.92 relies on X-Transmission-Session-Id (which is not a forbidden header for Fetch) for access control, which allows remote attackers to execute arbitrary RPC commands, and consequently write to arbitrary files, via POST requests to /transmission/rpc in conjunction with a DNS rebinding attack.

Which versions are affected by CVE-2018-5702?

It affects 2 products.

Products include Debian Debian Linux, Transmissionbt Transmission.

How do I fix CVE-2018-5702?

Apply the vendor's patch.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2018-5702 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-5702 exists.

Public exploit code: 1 Exploit-DB entry.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2018-5702, DLA-1246-1, DSA-4087-1, GHSA-6q4w-fhcp-mhw6, MGASA-2018-0230, UBUNTU-CVE-2018-5702 and 1 more.