CVE-2026-68569

Apache Tomcat: Principal lookup can fail open in some cases

HIGH

8.1

CVSS Score

Published: August 25, 2026 at 09:59 PM UTC

Updated: September 21, 2026 at 12:17 PM UTC

1 product affected across 1 vendorTomcat

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Severity

HIGH8.1

Exploit prediction

EPSS 0.5%

SSVC

No known exploit

Description

Improper Authentication vulnerability in Apache Tomcat meant that in some circumstances (e.g. CLIENT-CERT, SPNEGO) that a user would be authenticated even if the user did not exist in the DataSourceRealm. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.0 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.

Affected

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

Tomcat · Apache

95%

10.1.0 ≤ v < 10.1.5810.1.0-M1 ≤ v ≤ 10.1.5711.0.0 ≤ v < 11.0.2511.0.0-M1 ≤ v ≤ 11.0.247.0.0 ≤ v ≤ 7.0.1098.5.0 ≤ v ≤ 8.5.1008.5.0 ≤ v < 9.0.1219.0.0.M1 ≤ v ≤ 9.0.12010.1.0-M1 11.0.0-M1 7.0.0 8.5.0 9.0.0.M1

Affected range stops below 10.1.58, so it looks safe — our inference, not a vendor statement

Affected range stops below 11.0.25, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.0.121, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 7.0.0 (unknown)

Remediation

No guide yet

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

Patch and advisory references

https://lists.apache.org/thread/8robqo76q0osxgw0b5lcwgz0hcf9h4zc

References (2)

Vendor AdvisoryMailing List

Source: cverecord

https://lists.apache.org/thread/8robqo76q0osxgw0b5lcwgz0hcf9h4zc

Mailing ListThird Party Advisory

Source: af854a3a-2127-422b-91ae-364da2661108

http://www.openwall.com/lists/oss-security/2026/08/26/8

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

8.1HIGHCISA-ADP

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-287

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