What is CVE-2017-17455?

CVE-2017-17455 is a medium-severity vulnerability in Mahara, classified under Improper Certificate Validation. CVSS score: 5.9/10. Published 2018-02-20.

How severe is CVE-2017-17455?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Mahara

CVE-2017-17455

Mahara 16.10 before 16.10.7, 17.04 before 17.04.5, and 17.10 before 17.10.2 are vulnerable to being forced, via a man-in-the-middle attack, to interact with Mahara on the HTTP protocol rather than HTTPS even when an SSL certificate is present.

Vulnerability class: Improper Certificate Validation

Published 2018-02-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (46.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.9% 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: 0.006 · change: 0.000

Affected products

Mahara

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

mahara.org/interaction/forum/topic.php (Vendor Advisory)
bugs.launchpad.net/mahara/+bug/1734767 (Third Party Advisory)
reviews.mahara.org/ (Vendor Advisory)

Frequently asked questions

What is CVE-2017-17455?: CVE-2017-17455 is a medium-severity vulnerability in Mahara, classified under Improper Certificate Validation. CVSS score: 5.9/10. Published 2018-02-20.
How severe is CVE-2017-17455?: Medium severity. CVSS v3 base score is 5.9 out of 10.