w3m through 0.5.3 does not properly handle temporary files when the ~/.w3m directory is unwritable, which allows a local attacker to craft a symlink attack to overwrite arbitrary files.
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00028.html
http://www.securityfocus.com/bid/102855
https://bugs.debian.org/888097
https://github.com/tats/w3m/commit/18dcbadf2771cdb0c18509b14e4e73505b242753
https://salsa.debian.org/debian/w3m/commit/18dcbadf2771cdb0c18509b14e4e73505b242753
Source: MITRE
Published: 2018-01-25
Updated: 2019-10-03
Type: CWE-59
Base Score: 3.3
Vector: AV:L/AC:M/Au:N/C:N/I:P/A:P
Impact Score: 4.9
Exploitability Score: 3.4
Severity: LOW
Base Score: 4.7
Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
Impact Score: 3.6
Exploitability Score: 1
Severity: MEDIUM