6.5

CVE-2026-55956: apache software foundation apache tomcat Improper Authorization

CVSS: 6.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-55956DEBIAN-CVE-2026-55956
Published 29-06-2026Last modified 30-06-2026
Open JSON

Vulnerability summary

CVE-2026-55956 is a medium (CVSS 6.5) Improper Authorization vulnerability in apache software foundation apache tomcat. EPSS estimates a 0.69% chance of exploitation in the next 30 days, higher than 52.1% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.69%
0%100%
Low · -0.84 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 26 · Related 13
MGASA-2026-0323OPENSUSE-SU-2026:11195-1OPENSUSE-SU-2026:11208-1OPENSUSE-SU-2026:11209-1OPENSUSE-SU-2026:21327-1OPENSUSE-SU-2026:21328-1

Timeline

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

Description

Improper Authorization vulnerability in Apache Tomcat leads to security constraints specified for the default servlet ignoring any method or method omission configured as part of the constraint. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other versions that have reached end of support may also be affected. Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fix the issue.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.69%

Chance of exploitation in the next 30 days

Percentile

52%

Versus all other CVEs

30-day change

-0.84 pp

From 1.53% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.69%

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
  • tomcat10All versions (No fix recorded) | < 10.1.60-1
  • tomcat11All versions (No fix recorded) | < 11.0.24-1
  • tomcat9< 9.0.70-2
Apache1 product
  • tomcat< 9.0.119 | ≥ 10.1.0, < 10.1.56 | ≥ 11.0.0, < 11.0.23
Apache software foundation1 product
  • apache tomcat≥ 11.0.0-M1, ≤ 11.0.22 | ≥ 10.1.0-M1, ≤ 10.1.55 | ≥ 9.0.0.M1, ≤ 9.0.118 | ≥ 8.5.0, ≤ 8.5.100 | ≥ 7.0.0, ≤ 7.0.109

4 vendors · 11 products

References

8 links