9.8

CVE-2026-86248: apache software foundation apache tomcat Improper Authentication

CVSS: 9.8v3.1CriticalAwaiting analysis
AliasesUBUNTU-CVE-2026-86248DEBIAN-CVE-2026-86248
Published 23-09-2026Last modified 23-09-2026
Open JSON

Vulnerability summary

CVE-2026-86248 is a critical (CVSS 9.8) Improper Authentication vulnerability in apache software foundation apache tomcat. EPSS estimates a 0.39% chance of exploitation in the next 30 days, higher than 31.1% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.39%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 10 · Related 7
MGASA-2026-0479OPENSUSE-SU-2026:11906-1OPENSUSE-SU-2026:11907-1OPENSUSE-SU-2026:11908-1OPENSUSE-SU-2026:21984-1RHSA-2026:68257

Timeline

  1. 23-09-2026
    PublishedVulnerability first disclosed.
  2. 23-09-2026
    Last modifiedVulnerability information updated.

Description

CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M14 through 11.0.25, from 10.1.22 through 10.1.59, from 9.0.92 through 9.0.121. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.39%

Chance of exploitation in the next 30 days

Percentile

31%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

24-09-202618-10-2026
EPSS score
0.39%

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
Apache software foundation1 product
  • apache tomcat≥ 11.0.0-M14, ≤ 11.0.25 | ≥ 10.1.22, ≤ 10.1.59 | ≥ 9.0.92, ≤ 9.0.121

3 vendors · 10 products

References

7 links