What is CVE-2026-73237?

CVE-2026-73237 is a medium-severity vulnerability in Apache Allura, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 6.1/10. Published 2026-08-12.

How severe is CVE-2026-73237?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Apache Allura

CVE-2026-73237

XSS vulnerability in Markdown handling in Apache Allura. This issue affects Apache Allura: from 1.10.0 before 1.19.1. Users are recommended to upgrade to version 1.19.1, which fixes the issue.

Published 2026-08-12 · last modified 2026-08-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (54.6th percentile), scored 2026-09-27.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.008 · change: +0.004

Affected products

Apache Allura
Apache Software Foundation Allura — versions 1.10.0

Weakness classification (CWE)

CWE-80 — Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

References

allura.apache.org/posts/2026-allura-1.19.1.html (Release Notes)
lists.apache.org/thread/p7bd1yz9v9wbsbc6hz3tjxozxnwyzqz0 (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-73237?: CVE-2026-73237 is a medium-severity vulnerability in Apache Allura, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 6.1/10. Published 2026-08-12.
How severe is CVE-2026-73237?: Medium severity. CVSS v3 base score is 6.1 out of 10.