XSS in Srimax Output Messenger

CVE-2025-27921

A reflected cross-site scripting (XSS) vulnerability was discovered in Output Messenger before 2.0.63, where unsanitized input could be injected into the web application’s response. This vulnerability occurs when user-controlled input is reflected back into the browser without proper sanitization or encoding.

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

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 (29.5th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-27921: held from 0.004 to 0.004.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-27921?
CVE-2025-27921 is a medium-severity vulnerability in Srimax Output Messenger, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-05-05.
How severe is CVE-2025-27921?
Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2025-27921 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.