# Important security fix, please upgrade your system to 11.1.21!
**URL:** https://forum.yunohost.org/t/important-security-fix-please-upgrade-your-system-to-11-1-21/25098
**Category:** Security
**Created:** [June 11, 2023, 6:22pm UTC](https://forum.yunohost.org/t/important-security-fix-please-upgrade-your-system-to-11-1-21/25098 "2023-06-11T18:22:28Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@YunoHost](https://forum.yunohost.org/u/YunoHost)
#### Post date: [June 11, 2023, 6:22pm UTC](https://forum.yunohost.org/t/important-security-fix-please-upgrade-your-system-to-11-1-21/25098/1 "2023-06-11T18:22:28Z")
Hi there!
We released important security fixes a few hours ago as part of version 11.1.21, and advise to upgrade your system as soon as possible.
The underlying security issues were a set of misconfigured file permissions that, _if combined with another arbitrary code execution_ from an app, could allow an attacker to escalate privileges.
**Note for advanced users** : if you tweaked your nginx conf manually, you may want to check the output of `yunohost tools regen-conf nginx --dry-run --with-diff` to manually propagate some of the changes, which may otherwise result in YunoHost being unable to self-diagnose or to renew Let’s Encrypt certificates
---
### Author:  [@Aleks](https://forum.yunohost.org/u/Aleks)
#### Post date: [June 11, 2023, 6:24pm UTC](https://forum.yunohost.org/t/important-security-fix-please-upgrade-your-system-to-11-1-21/25098/2 "2023-06-11T18:24:16Z")
---
### Author:  [@Aleks](https://forum.yunohost.org/u/Aleks)
#### Post date: [June 11, 2023, 6:24pm UTC](https://forum.yunohost.org/t/important-security-fix-please-upgrade-your-system-to-11-1-21/25098/3 "2023-06-11T18:24:20Z")
---
### Author:  [@Aleks](https://forum.yunohost.org/u/Aleks)
#### Post date: [July 17, 2023, 6:37pm UTC](https://forum.yunohost.org/t/important-security-fix-please-upgrade-your-system-to-11-1-21/25098/4 "2023-07-17T18:37:06Z")