Description
mod_auth_mellon before 0.13.1 is vulnerable to a Cross-Site Session Transfer attack, where a user with access to one web site running on a server can copy their session cookie to a different web site on the same server to get access to that site.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libapache2-mod-auth-mellon | 0.12.0-2 | — |
| Debian 13 | libapache2-mod-auth-mellon | 0.12.0-2 | — |
| Debian 12 | libapache2-mod-auth-mellon | 0.12.0-2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | libapache2-mod-auth-mellon | 0.12.0-2+deb9u1build0.16.04.1 | USN-4597-1 |
Advisories 1
- USN-4597-1 libapache2-mod-auth-mellon vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026