CVE-2026-55957

highpriority · track · 11EPSS 0.029 · 87 %ileexploit · PoCDEEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

2.85% (87th) EPSS

CVSS 7.3 · high

Is it mine?

39 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.3

v3.17.3highAV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Lsecondary · FSTEC (BDU) RU

v3.17.3highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Lsecondary · ENISA EU

v3.17.3highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Lsecondaryexploitability 3.9 · impact 3.4

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:Psecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-304USCWE-304US

exploits (1)

Public proof-of-concept and weaponised exploit code.

mdvpat/CVE-2026-55957-PoCReproducible Docker lab for the Apache Tomcat JNDIRealm GSSAPI authentication bypassPoC · poc_in_github

affected products (39)

Products and version ranges known to be affected.

Amazon Linux 2all versionscert_bundDEcpe:/o:amazon:linux_2:-
Broadcom Brocade SANnavall versionscert_bundDEcpe:/a:broadcom:brocade_sannav:-
IBM Power Hardware Management Console V10.3.1050.0-V10.3.1064.1all versionscert_bundDEcpe:/a:ibm:hardware_management_console:v10.3.1050.0_-_v10.3.1064.1
IBM Power Hardware Management Console V11.1.1110.0-V11.1.1112.2all versionscert_bundDEcpe:/a:ibm:hardware_management_console:v11.1.1110.0_-_v11.1.1112.2
IBM Power Hardware Management Console V11.2.1120.0all versionscert_bundDEcpe:/a:ibm:hardware_management_console:v11.2.1120.0
Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
RESF Rocky Linuxall versionscert_bundDEcpe:/o:resf:rocky_linux:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
SUSE openSUSEall versionscert_bundDEcpe:/o:suse:opensuse:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
Apache Tomcat< 10.1.37cert_bundDE
Apache Tomcat< 11.0.5cert_bundDE
Apache Tomcat< 9.0.101cert_bundDE
Dell Secure Connect Gateway< 5.36.00.16cert_bundDE
Apache Software Foundation Apache Tomcat≤ 11.0.0-M1 ≤11.0.4enisa_euvdEU
Apache Software Foundation Apache Tomcat≤ 8.5.0 ≤8.5.100enisa_euvdEU
Apache Software Foundation Apache Tomcat≤ 7.0.0 ≤7.0.109enisa_euvdEU
Apache Software Foundation Apache Tomcat≤ 10.1.0-M1 ≤10.1.36enisa_euvdEU
Apache Software Foundation Apache Tomcat≤ 9.0.0.M1 ≤9.0.100enisa_euvdEU

showing 20 of 39

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-2123Apache Tomcat: Mehrere SchwachstellenDeutsch2026-06-29csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Apache Tomcat ausnutzen, um Sicherheitsmaßnahmen zu umgehen, einen Denial-of-Service-Zustand zu verursachen, Cross-Site-Scripting-Angriffe durchzuführen oder andere, nicht näher spezifizierte Auswirkungen auszulösen.
BIT-tomcat-2026-55957Apache Tomcat: Authentication bypass with JNDIRealm and GSSAPI authenticated bind2026-09-11vendor · osvUS
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 through 11.0.4, from 10.1.0 through 10.1.36, from 9.0.0 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.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund osv NVD CVE.org MITRE

published 2026-06-29modified 2026-10-25

references (6)

External citations — patches, advisories, analysis.

scry

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