Mateusz Mandera

3 posts published

Release announcements, Security

Zulip Server 12.3 security release

We released Zulip Server 12.3 today! This is a security release, fixing a critical security issue (GHSA-42mq-rxcr-wj72) and three other security issues, as well as several bugs. We have requested CVE IDs for these issues, but they have not yet been assigned. Each issue is instead referenced below by …

Mateusz ManderaSep 21, 2026 • 5 min read

Release announcements, Security

Zulip Server 12.2 security release

We released Zulip Server 12.2 today! This release fixes five security issues and a couple of bugs. We have requested CVE IDs for these issues, but they have not yet been assigned. Each issue is instead referenced below by its GitHub security advisory. Upgrading We recommend that all installations upgrade …

Mateusz ManderaAug 10, 2026 • 2 min read

Release announcements

Zulip Server 12.1 bug fix release

We released Zulip Server 12.1 today! This is a bug fix release, containing cherry-picked changes since Zulip Server 12.0. Upgrading We recommend that all installations upgrade to this new release. See the upgrade instructions in the Zulip documentation. Zulip Cloud has already been upgraded with the …

Mateusz ManderaJun 26, 2026 • 3 min read