What is CVE-2026-34033?

CVE-2026-34033 is a medium-severity vulnerability in Apache Answer, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 5.4/10. Published 2026-06-09.

How severe is CVE-2026-34033?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Apache Answer

CVE-2026-34033

Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in Apache Answer. This issue affects Apache Answer: through 2.0.0. User-supplied content was included in notification emails without proper escaping, allowing authenticated users to inject arbitrary HTML into emails sent to other users. Users are recommended to upgrade to version 2.0.1, which fixes the issue.

Published 2026-06-09 · last modified 2026-07-23.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (26.9th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.003 · change: -0.002

Affected products

Apache Answer
Apache Software Foundation Answer — versions 0

Weakness classification (CWE)

References

lists.apache.org/thread/wrfd9blbfotfg479jr8vlwfx6pwr9sgj (vendor-advisory, Mailing List)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List)

Frequently asked questions

What is CVE-2026-34033?: CVE-2026-34033 is a medium-severity vulnerability in Apache Answer, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 5.4/10. Published 2026-06-09.
How severe is CVE-2026-34033?: Medium severity. CVSS v3 base score is 5.4 out of 10.