Vault and Vault Enterprise's (Vault) key-value v2 (kv-v2) diff viewer allowed HTML injection into the Vault web UI through key values. This vulnerability, CVE-2023-2121, is fixed in Vault 1.14.0, 1.13.3, 1.12.7, and 1.11.11.
https://discuss.hashicorp.com/t/hcsec-2023-17-vault-s-kv-diff-viewer-allowed-html-injection/54814