This security release addresses several vulnerabilities. Please upgrade when you can, particularly if your homeserver participates in open federation and/or has untrusted local users. High severity: - Fix [ELEMENTSEC-2026-1071](https://github.com/element-hq/synapse/security/advisories/GHSA-fp53-rw9v-hcf9) - Fix [ELEMENTSEC-2024-1520](https://github.com/element-hq/synapse/security/advisories/GHSA-rgv2-84w7-5j9p) - Fix [ELEMENTSEC-2026-1717](https://github.com/element-hq/synapse/security/advisories/GHSA-27p5-4f45-gx76) - Fix [ELEMENTSEC-2026-1721](https://github.com/element-hq/synapse/security/advisories/GHSA-95fh-hv8c-chvq) - Fix [ELEMENTSEC-2026-1729](https://github.com/element-hq/synapse/security/advisories/GHSA-cjh7-rcpx-xpf8) - Fix [ELEMENTSEC-2026-1740](https://github.com/element-hq/synapse/security/advisories/GHSA-6wjm-9p2x-gvpm) Moderate severity: - Fix [ELEMENTSEC-2026-1714](https://github.com/element-hq/synapse/security/advisories/GHSA-qcjr-46gf-7f4r) - Fix [ELEMENTSEC-2026-1718](https://github.com/element-hq/synapse/security/advisories/GHSA-r66v-qhwx-8rg4) - Fix [ELEMENTSEC-2026-1751](https://github.com/element-hq/synapse/security/advisories/GHSA-jhcg-5392-5mjw) Low severity: - Fix [ELEMENTSEC-2026-1703](https://github.com/element-hq/synapse/security/advisories/GHSA-vh4c-pqh4-w3wq) - Fix [ELEMENTSEC-2026-1760](https://github.com/element-hq/synapse/security/advisories/GHSA-hgcg-p9gx-fq5f)