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CVE-2026-55276

42
FAUCET Score

Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat meant that special roles and empty authorisation constraints were not included when the effective web.xml was logged. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected. Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119 which fixes the issue.

First published: Jun 29, 2026Last modified: Jun 29, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 9.0.119CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
>= 10.1.0, < 10.1.56CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
>= 11.0.0, < 11.0.23CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
>= 10.1.0-M1, <= 10.1.55CPE match
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
>= 11.0.0-M1, <= 11.0.22CPE match
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.54%
Probability of exploitation in next 30 days
EPSS Percentile
42.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0054 is in the 22nd percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

ubuntupatch availablevia ubuntu_usn
Product: tomcat8 (bionic)Fixed in: 8.5.39-1ubuntu1~18.04.3+esm6
ubuntupatch availablevia ubuntu_usn
Product: tomcat8 (xenial)Fixed in: 8.0.32-1ubuntu1.13+esm2
apachevendor investigatingvia vendor_rss
View patch

Vendor Advisories (2)

ubuntuUSN-8551-1

Tomcat vulnerabilities

Jul 15, 2026
apacheapache:www.mail-archive.com/[email protected]/msg11329.html

[SECURITY] CVE-2026-55276 Apache Tomcat - Logged effective web.xml is incomplete

Jun 29, 2026

References

openwall.com / lists/oss-security/2026/06/29/23
Third Party Advisory
lists.apache.org / thread/jy09xjlzn6r2qwvqoph8vcmf959yq68v
Vendor AdvisoryMailing List