Description
A missing link validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows execution of a stored XSS attack using Internet Explorer when saving a 'javascript:' URL in markdown format.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Nextcloud Server | Fixed in 20.0.2, 19.0.5, 18.0.11 | — |
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.
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP3 | nextcloud | 20.0.11-bp153.2.3.1 | openSUSE-SU-2021:1068-1 |
| SUSE Package Hub 15 SP2 | nextcloud | 20.0.7-bp152.2.6.1 | openSUSE-SU-2021:1068-1, openSUSE-SU-2021:0274-1 |
| SUSE Package Hub 15 SP1 | nextcloud | 20.0.11-bp153.2.3.1 | openSUSE-SU-2021:1068-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 12 | nextcloud | 20.0.11-bp153.2.3.1 | openSUSE-SU-2021:1068-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | nextcloud | 20.0.11-bp153.2.3.1 | openSUSE-SU-2021:1068-1 |
| openSUSE Leap 15.2 | nextcloud | 20.0.7-lp152.3.6.1 | openSUSE-SU-2021:1068-1, openSUSE-SU-2021:0262-1 |
Advisories 3
- openSUSE-SU-2021:1068-1 Security update for nextcloud SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0274-1 Security update for nextcloud SUSE / openSUSE Security Updates · May 7, 2025
- openSUSE-SU-2021:0262-1 Security update for nextcloud SUSE / openSUSE Security Updates · May 7, 2025