What is CVE-2017-18121?

CVE-2017-18121 is a medium-severity vulnerability in Simplesamlphp, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-02-02.

How severe is CVE-2017-18121?

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

XSS in Simplesamlphp

CVE-2017-18121

The consentAdmin module in SimpleSAMLphp through 1.14.15 is vulnerable to a Cross-Site Scripting attack, allowing an attacker to craft links that could execute arbitrary JavaScript code on the victim's web browser.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-02-02 · 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: 0.012 (67.8th percentile), scored 2026-10-24.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 67.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: -0.000

Affected products

Simplesamlphp
Debian Linux — versions 7.0, 8.0, 9.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

simplesamlphp.org/security/201709-01 (Vendor Advisory)
lists.debian.org/debian-lts-announce/2018/02/msg00008.html (mailing-list, Mailing List, Third Party Advisory)
www.debian.org/security/2018/dsa-4127 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2017-18121?: CVE-2017-18121 is a medium-severity vulnerability in Simplesamlphp, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-02-02.
How severe is CVE-2017-18121?: Medium severity. CVSS v3 base score is 6.1 out of 10.