Spring Security Advisories

CVE-2020-5421: RFD Protection Bypass via jsessionid

HIGH | SEPTEMBER 17, 2020 | CVE-2020-5421


In Spring Framework versions 5.2.0 - 5.2.8, 5.1.0 - 5.1.17, 5.0.0 - 5.0.18, 4.3.0 - 4.3.28, and older unsupported versions, the protections against RFD attacks from CVE-2015-5211 may be bypassed depending on the browser used through the use of a jsessionid path parameter.

Affected Spring Products and Versions

  • Spring Framework
    • 5.2.0 to 5.2.8
    • 5.1.0 to 5.1.17
    • 5.0.0 to 5.0.18
    • 4.3.0 to 4.3.28
    • Older, unsupported versions



  • Spring Framework
    • 5.2.9
    • 5.1.18
    • 5.0.19
    • 4.3.29


This issue was identified and responsibly reported by Keitaro Yamazaki / Ierae Security.


  • 2020-09-17: Initial vulnerability report published.

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