What is CVE-2015-9391?

CVE-2015-9391 is a medium-severity vulnerability in Ostenta Yawpp, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-09-20.

How severe is CVE-2015-9391?

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

Is CVE-2015-9391 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Ostenta Yawpp

CVE-2015-9391

The yawpp plugin through 1.2.2 for WordPress has XSS via the field1 parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-09-20 · last modified 2026-06-17.

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: 0.013 (69.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Ostenta Yawpp

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

wpvulndb.com/vulnerabilities/8351 (Third Party Advisory)
wordpress.org/plugins/yawpp/ (Third Party Advisory)

Frequently asked questions

What is CVE-2015-9391?: CVE-2015-9391 is a medium-severity vulnerability in Ostenta Yawpp, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-09-20.
How severe is CVE-2015-9391?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2015-9391 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.