Description
SOGo 2.x before 2.4.1 and 3.x through 5.x before 5.1.1 does not validate the signatures of any SAML assertions it receives. Any actor with network access to the deployment could impersonate users when SAML is the authentication method. (Only versions after 2.0.5a are affected.)
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 13 | sogo | 5.1.1-1 | — |
| Debian 12 | sogo | 5.1.1-1 | — |
| Debian 11 | sogo | 5.0.1-4+deb11u1 | DSA-5029-1 |
| Debian 10 | sogo | 4.0.7-1+deb10u2 | DSA-5029-1 |
| Debian 9 | sogo | 3.2.6-2+deb9u1 | DLA-2707-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | sogo | 5.12.4-1.2ubuntu0.1~esm1 | USN-8504-1 |
| Ubuntu Pro 22.04 LTS | sogo | 5.5.1-1ubuntu0.1~esm1 | USN-8504-1 |
| Ubuntu Pro 20.04 LTS | sogo | 4.3.0-1ubuntu0.1~esm1 | USN-8504-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | sogo | 3.2.10-1ubuntu0.1~esm1 | USN-8504-1 |
| Ubuntu Pro 16.04 LTS | sogo | 2.2.17a-1.1ubuntu0.1~esm1 | USN-8504-1 |
Advisories 3
- USN-8504-1 sogo vulnerabilities Ubuntu Security Notices (USN) · Jul 6, 2026
- DSA-5029-1 sogo - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2707-1 sogo - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://www.sogo.nu/news.html
- https://github.com/inverse-inc/sogo/blob/master/CHANGELOG.md
- https://blogs.akamai.com/2021/06/sogo-and-packetfence-impacted-by-saml-implementation-vulnerabilities.html
- [debian-lts-announce] 20210712 [SECURITY] [DLA 2707-1] sogo security update mailing-list
- DSA-5029 vendor-advisory