7.3

CVE-2026-55957: apache software foundation apache tomcat Missing Critical Step in Authentication

CVSS: 7.3v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-55957DEBIAN-CVE-2026-55957
Published 29-06-2026Last modified 30-06-2026
Open JSON

Vulnerability summary

CVE-2026-55957 is a high (CVSS 7.3) Missing Critical Step in Authentication vulnerability in apache software foundation apache tomcat. EPSS estimates a 2.85% chance of exploitation in the next 30 days, higher than 86.5% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.3/10
010
High · v3.1 (CVE.org)
EPSS score
2.85%
0%100%
Low · -0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 13
MGASA-2026-0323RHSA-2026:18536RHSA-2026:18537RHSA-2026:18916RHSA-2026:29203RHSA-2026:32960

Timeline

  1. 29-06-2026
    PublishedVulnerability first disclosed.
  2. 30-06-2026
    Last modifiedVulnerability information updated.

Description

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 metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

2.85%

Chance of exploitation in the next 30 days

Percentile

87%

Versus all other CVEs

30-day change

-0.01 pp

From 2.86% on 18-09-2026

18-09-202618-10-2026
EPSS score
2.85%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu6 products
  • tomcat10All versions (No fix recorded)
  • tomcat11All versions (No fix recorded)
  • tomcat6All versions (No fix recorded)
  • tomcat7All versions (No fix recorded)
  • tomcat8All versions (No fix recorded)
Debian3 products
  • tomcat10< 10.1.52-1~deb12u1 | < 10.1.52-1~deb13u1 | < 10.1.40-1
  • tomcat11< 11.0.15-1~deb13u1 | < 11.0.5-1
  • tomcat9< 9.0.70-2
Apache1 product
  • tomcat< 9.0.101 | ≥ 10.1.0, < 10.1.37 | ≥ 11.0.0, < 11.0.5
Apache software foundation1 product
  • apache tomcat≥ 11.0.0-M1, ≤ 11.0.4 | ≥ 10.1.0-M1, ≤ 10.1.36 | ≥ 9.0.0.M1, ≤ 9.0.100 | ≥ 8.5.0, ≤ 8.5.100 | ≥ 7.0.0, ≤ 7.0.109

4 vendors · 11 products

References

8 links