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Medium severity · published Jun 29, 2026
CVE-2026-55955
Apache Tomcat: EncryptInterceptor not protected against replay attacks
6.5
CVSS
0.4%
EPSS
No
On KEV
Description
Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the EncryptionInterceptor in the cluster component. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.13 through 9.0.18, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109. Users are recommended to upgrade to version 11.0.23, 10.1.56, 9.0.119, which fixes the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TO
Tomcat · Apache
11.0.0-M1 through 11.0.22; 10.1.0-M1 through 10.1.55; 9.0.13 through 9.0.118; 8.5.38 through 8.5.100; 7.0.100 through 7.0.109 · source: vendor, NVD
Affected product
TO
Tomcat
Apache
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55955
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55955
Mailing List
https://lists.apache.org/thread/g4p5sf45p3f9r011pwqs9r54yd64s106
Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/06/29/24
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