PyPI/matrix-synapse CVE-2021-21332: medium 6.9, EPSS 1.22%

Cross-site scripting (XSS) vulnerability in the password reset endpoint

Action: Upgrade matrix-synapse to 1.27.0 or later.

pip install matrix-synapse==1.27.0

Affected

Fixed versions

Sources

• osv: GHSA-246w-56m2-5899
• https://github.com/matrix-org/synapse/security/advisories/GHSA-246w-56m2-5899
• https://nvd.nist.gov/vuln/detail/CVE-2021-21332
• https://github.com/matrix-org/synapse/pull/9200
• https://github.com/matrix-org/synapse/commit/e54746bdf7d5c831eabe4dcea76a7626f1de73df
• https://github.com/matrix-org/synapse
• https://github.com/matrix-org/synapse/releases/tag/v1.27.0
• https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2021-133.yaml
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY

CVE-2021-21332 · published 2021-03-26T19:52:54Z · modified 2026-07-08T06:27:41.588536149Z · JSON