What is CVE-2018-12587?

CVE-2018-12587 is a medium-severity vulnerability in German Spelling Dictionary Project, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-08-13.

How severe is CVE-2018-12587?

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

XSS in German Spelling Dictionary Project

CVE-2018-12587

A cross-site scripting (XSS) vulnerability was found in valeuraddons German Spelling Dictionary v1.3 (an Opera Browser add-on). Instead of providing text for a spelling check, remote attackers may inject arbitrary web script or HTML via the ajax query parameter in the URL Address Bar.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-08-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (55.4th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

German Spelling Dictionary Project — versions 1.3

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

metamorfosec.com/Files/Advisories/METS-2018-003-A_XSS_Vulnerability_in_German_S… (Third Party Advisory)
www.openbugbounty.org/reports/610381/ (Third Party Advisory)

Frequently asked questions

What is CVE-2018-12587?: CVE-2018-12587 is a medium-severity vulnerability in German Spelling Dictionary Project, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-08-13.
How severe is CVE-2018-12587?: Medium severity. CVSS v3 base score is 6.1 out of 10.