8.1

CVE-2026-66422: apache software foundation apache tomcat Improper Authorization

CVSS: 8.1v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-66422DEBIAN-CVE-2026-66422
Published 25-08-2026Last modified 26-08-2026
Open JSON

Vulnerability summary

CVE-2026-66422 is a high (CVSS 8.1) Improper Authorization vulnerability in apache software foundation apache tomcat. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 35.9% of scored vulnerabilities.

Overall risk
32/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.43%
0%100%
Low · -0.14 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 21 · Related 16
MGASA-2026-0376OPENSUSE-SU-2026:11759-1OPENSUSE-SU-2026:11760-1OPENSUSE-SU-2026:11761-1OPENSUSE-SU-2026:21810-1OPENSUSE-SU-2026:21811-1

Timeline

  1. 25-08-2026
    PublishedVulnerability first disclosed.
  2. 26-08-2026
    Last modifiedVulnerability information updated.

Description

Improper Authorization vulnerability in Apache Tomcat cause by security-role-ref definitions being incorrectly used as role aliases within the Realm in additional to the correct usage with Request.isUserInRole(). This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.25 through 9.0.120. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.46 through 8.5.100, from 7.0.97 through 7.0.109. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.43%

Chance of exploitation in the next 30 days

Percentile

36%

Versus all other CVEs

30-day change

-0.14 pp

From 0.57% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.43%

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)
  • tomcat9< 9.0.70-2
Apache1 product
  • tomcat≥ 7.0.97, ≤ 7.0.109 | ≥ 8.5.46, < 9.0.121 | ≥ 10.1.0, < 10.1.58 | ≥ 11.0.0, < 11.0.25
Apache software foundation1 product
  • apache tomcat≥ 11.0.0-M1, ≤ 11.0.24 | ≥ 10.1.0-M1, ≤ 10.1.57 | ≥ 9.0.25, ≤ 9.0.120 | ≥ 8.5.46, ≤ 8.5.100 | ≥ 7.0.97, ≤ 7.0.109

4 vendors · 11 products

References

8 links