In the Jakarta Expression Language implementation 3.0.3 and earlier, a bug in the ELParserTokenManager enables invalid EL expressions to be evaluated as if they were valid.
References:
https://github.com/eclipse-ee4j/el-ri/issues/155 https://securitylab.github.com/advisories/GHSL-2020-021-jakarta-el/
In the Jakarta Expression Language implementation 3.0.3 and earlier, a bug in the ELParserTokenManager enables invalid EL expressions to be evaluated as if they were valid.