The vulnerability of the JavaScript-based Thymeleaf engine arises from the lack of measures taken to neutralize special elements used in the expression language operator, allowing attackers to execute arbitrary code.
🗓️ 27 Apr 2026 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType 
bdu_fstec🔗 bdu.fstec.ru👁 11 Views
| Reporter | Title | Published | Views | Family All 23 |
|---|---|---|---|---|
 | CVE-2026-40478 | 17 Apr 202621:57 | – | attackerkb |
 | CVE-2026-40478 | 17 Apr 202623:20 | – | circl |
 | thymeleaf 安全漏洞 | 17 Apr 202600:00 | – | cnnvd |
 | CVE-2026-40478 | 17 Apr 202621:57 | – | cve |
 | CVE-2026-40478 Improper neutralization of specific syntax patterns for unauthorized expressions in Thymeleaf | 17 Apr 202621:57 | – | cvelist |
 | Security Bulletin: MongoDB Enterprised Advanced affected by: Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection') (CVE-2026-40477, CVE-2026-40478) | 16 Jun 202614:11 | – | ibm |
 | Improper neutralization of specific syntax patterns for unauthorized expressions in Thymeleaf | 15 Apr 202619:46 | – | github |
 | CVE-2026-40478 | 17 Apr 202622:16 | – | nvd |
 | GHSA-XJW8-8C5C-9R79 Improper neutralization of specific syntax patterns for unauthorized expressions in Thymeleaf | 15 Apr 202619:46 | – | osv |
 | PT-2026-33215 | 15 Apr 202600:00 | – | ptsecurity |
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23 Jul 2026 00:00Current
6.4Medium risk
Vulners AI Score6.4
CVSS 27.6
CVSS 39
EPSS0.00766