CVE-2026-76183

criticalpriority · track · 10EPSS 0.006 · 47 %ileexploit · PoCDEFRUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

0.57% (47th) EPSS

CVSS 9.8 · critical

Is it mine?

12 products

Check your exposure

Who says so?

3 sources

cert_bund · osv · certfr

EPSS · scored 2026-10-27

Authentication Bypass by Alternate Name vulnerability in Apache Tomcat allowed the security constraints for any WebSocket endpoint to be bypassed. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M1 through 9.0.121. The following versions were EOS at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.43 through 7.0.109. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

cvss

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

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondaryexploitability 3.9 · impact 5.9

v3.19.3criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/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-289US

exploits (1)

Public proof-of-concept and weaponised exploit code.

Ethen1212/tomcat-CVE-2026-76183Apache Tomcat WebSocket security constraint bypass (CVE-2026-76183) reproductionPoC · poc_in_github

affected products (12)

Products and version ranges known to be affected.

Amazon Linux 2all versionscert_bundDEcpe:/o:amazon:linux_2:-
F5 BIG-IPall versionscert_bundDEcpe:/a:f5:big-ip:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
SUSE openSUSEall versionscert_bundDEcpe:/o:suse:opensuse:-
Apache Tomcat< 10.1.60cert_bundDE
Apache Tomcat< 11.0.26cert_bundDE
Apache Tomcat< 9.0.122cert_bundDE
Open Source Camunda< 7.24.16cert_bundDE
Bitnami tomcat< 9.0.45osvUSpkg:bitnami/tomcat
Bitnami tomcat10.1.0 → 10.1.60osvUSpkg:bitnami/tomcat
Bitnami tomcat11.0.0 → 11.0.26osvUSpkg:bitnami/tomcat
Bitnami tomcat9.0.0 → 9.0.122osvUSpkg:bitnami/tomcat

advisories (4)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-3527Apache Tomcat: Mehrere SchwachstellenDeutsch2026-09-22csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Apache Tomcat ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um einen Denial of Service Angriff durchzuführen und um Daten zu manipulieren.
BIT-tomcat-2026-76183Apache Tomcat: Bypass of security constraints for WebSocket endpoints2026-10-01vendor · osvUS
Authentication Bypass by Alternate Name vulnerability in Apache Tomcat allowed the security constraints for any WebSocket endpoint to be bypassed. This issue affects Apache Tomcat: from 11.0.0 through 11.0.25, from 10.1.0 through 10.1.59, from 9.0.0 through 9.0.121. The following versions were EOS at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.43 through 7.0.109. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
CERTFR-2026-AVI-1336Multiples vulnérabilités dans les produits IBMFrançais2026-10-16vendor · certfrFR
CERTFR-2026-AVI-1385Multiples vulnérabilités dans les produits VMwareFrançais2026-10-26vendor · certfrFR

sources

Which sources assert this record, and when.

cert_bund osv certfr NVD CVE.org MITRE

published 2026-09-23modified 2026-09-30

references (2) nvd

External citations — patches, advisories, analysis.

scry

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