What is CVE-2026-25688?

CVE-2026-25688 is a medium-severity vulnerability in Apache Answer, classified under Improper Neutralization of Alternate XSS Syntax. CVSS score: 6.1/10. Published 2026-06-09.

How severe is CVE-2026-25688?

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

XSS in Apache Answer

CVE-2026-25688

Improper Neutralization of Alternate XSS Syntax vulnerability in Apache Answer. This issue affects Apache Answer: through 2.0.0. AI-generated response content was rendered in the browser without proper sanitization, allowing malicious scripts to be executed when the content was viewed. 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 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: 0.004 (35.0th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.004 · change: -0.002

Affected products

Apache Answer
Apache Software Foundation Answer — versions 0

Weakness classification (CWE)

CWE-87 — Improper Neutralization of Alternate XSS Syntax

References

lists.apache.org/thread/x42joj43rqb38ms5q60f7bgq3qbo7t5q (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-25688?: CVE-2026-25688 is a medium-severity vulnerability in Apache Answer, classified under Improper Neutralization of Alternate XSS Syntax. CVSS score: 6.1/10. Published 2026-06-09.
How severe is CVE-2026-25688?: Medium severity. CVSS v3 base score is 6.1 out of 10.