CVE-2026-68569

HIGH 8.1

Published 2026-08-25 · Last modified 2026-08-26

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.

ELEVATED IMPACT

Severe if exploited (CVSS 8.1), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.5%chance of exploitation in 30 days · 42nd percentile

○ In CISA KEV ○ Public exploit / PoC

Impact if exploited

8.1CVSS 3.1 · HIGH

ConfidentialityHigh
IntegrityHigh
AvailabilityNone

What an attacker needs

✓Access: Reachable over the network — no local access needed
⚠Privileges: Requires a low-privilege account
✓User interaction: No user interaction needed
✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

github-search Search GitHub for public PoC repos

Test against your own equipment

curl -s https://vulnpedia.com/cve/CVE-2026-68569/poc.jsonMachine-readable PoC index for this CVE (for automation).

Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-68569/poc.json

Affected

Vendors Apache Software Foundation Apache

Products Apache Tomcat Tomcat

Weakness (CWE)

CWE-287: Improper Authentication

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Known Affected Software Configurations

Vendor	Product	Version range
Apache	Tomcat	≥ 7.0.0 and ≤ 7.0.109
Apache	Tomcat	≥ 8.5.0 and < 9.0.121
Apache	Tomcat	≥ 10.1.0 and < 10.1.58
Apache	Tomcat	≥ 11.0.0 and < 11.0.25

All CVSS metrics

HIGH 8.1 v3.1 · ADP Primary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
HIGH 8.1 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References

Advisories

https://lists.apache.org/thread/8robqo76q0osxgw0b5lcwgz0hcf9h4zc vendor-advisoryVendor AdvisoryMailing List
http://www.openwall.com/lists/oss-security/2026/08/26/8 Third Party AdvisoryMailing List

Sources: NVD · CVE.org · EPSS