CVE-2021-28170

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.

Weakness

The product constructs all or part of an expression language (EL) statement in a framework such as a Java Server Page (JSP) using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended EL statement before it is executed.

Affected Software

Potential Mitigations

• If user-controlled data must be added to an expression interpreter, one or more of the following should be performed:

References

• https://github.com/eclipse-ee4j/el-ri/issues/155
• https://securitylab.github.com/advisories/GHSL-2020-021-jakarta-el/
• https://www.oracle.com/security-alerts/cpuapr2022.html