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CVE-2026-75973

Apache Tomcat: Cross-context authentication mix-up with Jakarta Authentication configured

HIGH
7.3
CVSS Score
Published: September 23, 2026 at 11:14 AM UTC
Updated: September 23, 2026 at 07:30 PM UTC
1 product affected across 1 vendorTomcat

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Severity
HIGH7.3
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

Improper Authentication vulnerability in Apache Tomcat. When Jakarta Authentication was configured with SimpleAuthConfigProvider as the default provider and multiple web application used that provider, the realm for the first web application to authenticate a request would be used for all web applications. 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.M4 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60, 9.0.122, which fixes the issue.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Tomcat· Apache
60%
10.1.0-M1 ≤ v ≤ 10.1.5911.0.0-M1 ≤ v ≤ 11.0.258.5.0 ≤ v ≤ 8.5.1009.0.0.M4 ≤ v ≤ 9.0.12110.1.0-M111.0.0-M18.5.09.0.0.M4
Vendor states this is fixed in 7.0.109 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: [email protected]
https://lists.apache.org/thread/njjcdkkzqyzx4n3ffc4ffjmyh5mpl1gr
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.openwall.com/lists/oss-security/2026/09/23/20

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.3HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-287

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