CVE-2026-55957

VendorapacheProducttomcatDiscoveredJun 29, 2026UpdatedOct 25, 2026

Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to authenticate binds using GSSAPI allowed attackers to authenticate without provided the correct password. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1 through 10.1.36, from 9.0.0.M1 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue.

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CVSS v3.1

7.3 HIGH

EPSS

2.85%

probability of exploitation in 30 days

CISA KEV

Not listed

no confirmed exploitation reported

News coverage

sources referencing this CVE

Related IOCs

seen in the same coverage

EPSS Trend

Sep 25, 2026 → Sep 26, 2026

▲ 2.05pp

0.81% → 2.85% over 2 tracked changes

CVSS v3.1 Detail

Attack VectorNETWORK

Attack ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

ScopeUNCHANGED

ConfidentialityLOW

IntegrityLOW

AvailabilityLOW

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Connections

2 relationships

tomcat

source

Timeline

disclosure → media coverage

Jun 29, 2026

Disclosure — published as a CVE record. · last revised by NVD Oct 25, 2026

Public PoC (1)

github.com/mdvpat/CVE-2026-55957-PoC

Unverified third-party code — review before executing.