Description
All versions of the qBittorrent client through 4.5.5 use default credentials when the web user interface is enabled. The administrator is not forced to change the default credentials. As of 4.5.5, this issue has not been fixed. A remote attacker can use the default credentials to authenticate and execute arbitrary operating system commands using the "external program" feature in the web user interface. This was reportedly exploited in the wild in March 2023.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| qBittorrent | qBittorrent client | ≤ 4.5.5 | — |
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 | qbittorrent | No fix yet | — |
| Debian 13 | qbittorrent | No fix yet | — |
| Debian 12 | qbittorrent | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | qbittorrent | No fix yet | — |
| Ubuntu 26.04 LTS | qbittorrent | No fix yet | — |
| Ubuntu 25.10 | qbittorrent | No fix yet | — |
| Ubuntu 24.04 LTS | qbittorrent | No fix yet | — |
| Ubuntu 22.04 LTS | qbittorrent | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | qbittorrent | No fix yet | — |
| Ubuntu 18.04 LTS | qbittorrent | No fix yet | — |
| Ubuntu 16.04 LTS | qbittorrent | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP5 | libtorrent-rasterbar | 2.0.9-bp155.2.3.1 | openSUSE-SU-2023:0391-1 |
| SUSE Package Hub 15 SP5 | qbittorrent | 4.6.2-bp155.2.3.1 | openSUSE-SU-2023:0391-1 |
| SUSE Package Hub 15 SP4 | libtorrent-rasterbar | 2.0.9-bp155.2.3.1 | openSUSE-SU-2023:0391-1 |
| SUSE Package Hub 15 SP4 | qbittorrent | 4.6.2-bp155.2.3.1 | openSUSE-SU-2023:0391-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.5 | libtorrent-rasterbar | 2.0.9-bp155.2.3.1 | openSUSE-SU-2023:0391-1 |
| openSUSE Leap 15.5 | qbittorrent | 4.6.2-bp155.2.3.1 | openSUSE-SU-2023:0391-1 |
| openSUSE Leap 15.4 | libtorrent-rasterbar | 2.0.9-bp155.2.3.1 | openSUSE-SU-2023:0391-1 |
| openSUSE Leap 15.4 | qbittorrent | 4.6.2-bp155.2.3.1 | openSUSE-SU-2023:0391-1 |
Advisories 1
- openSUSE-SU-2023:0391-1 Security update for libtorrent-rasterbar, qbittorrent SUSE / openSUSE Security Updates · May 7, 2025
References
- https://github.com/qbittorrent/qBittorrent/issues/18731 issue-tracking
- https://vulncheck.com/advisories/qbittorrent-default-creds third-party-advisory
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T5WXBKELVZFZNIDONIJESOCSRPIQNCGI/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U4BNFJR3ZWVLE2YSYIQYBWVDQBBZOLEL/