CVE-2026-27120
Leafkit is a templating language with Swift-inspired syntax. Prior to 1.4.1, htmlEscaped in leaf-kit will only escape html special characters if the extended grapheme clusters match, which allows bypassing escaping by using an extended grapheme cluster containing both the special html character and some additional characters. In the case of html attributes, this can lead to XSS if there is a leaf variable in the attribute that is user controlled. This vulnerability is fixed in 1.4.1.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 6.1
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS probability
- 0.23%
- CWE
- CWE-75, CWE-79, CWE-87
- Published
- 2026-02-20
- Last modified
- 2026-03-12
Affected products
- vapor leaf-kit
Weakness type
Related vulnerabilities
- CVE-2024-58362 — SurrealDB before 1.5.5 Query Injection via RPC API
- CVE-2026-54771 — Langroid: handle_message() executes user-supplied tool JSON without sender verification
- CVE-2026-31908 — Apache APISIX: forward auth plugin allows header injection
- CVE-2026-29042 — Nuclio Shell Runtime Command Injection Leading to Privilege Escalation
- CVE-2025-61911 — python-ldap has sanitization bypass in ldap.filter.escape_filter_chars
- CVE-2025-50213 — Apache Airflow Providers Snowflake: Potential SQL injection in CopyFromExternalStageToSnowflakeOperator
- CVE-2024-9940 — Calculated Fields Form <= 5.2.45 - HTML Injection
- CVE-2023-1758 — Failure to Sanitize Special Elements into a Different Plane (Special Element Injection) in thorsten/phpmyfaq