What is CVE-2017-18088?

CVE-2017-18088 is a medium-severity vulnerability in Atlassian Bitbucket, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2018-02-15.

How severe is CVE-2017-18088?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Improper input validation in Atlassian Bitbucket

CVE-2017-18088

Various plugin servlet resources in Atlassian Bitbucket Server before version 5.3.7 (the fixed version for 5.3.x), from version 5.4.0 before 5.4.6 (the fixed version for 5.4.x), from version 5.5.0 before 5.5.6 (the fixed version for 5.5.x), from version 5.6.0 before 5.6.3 (the fixed version for 5.6.x), from version 5.7.0 before 5.7.1 (the fixed version for 5.7.x) and before 5.8.0 allow remote attackers to conduct clickjacking attacks via framing various resources that lacked clickjacking protection.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2018-02-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.010 (61.9th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 62nd percentile — 61.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Atlassian Bitbucket

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.securityfocus.com/bid/103040 (VDB Entry, Third Party Advisory, vdb-entry)
jira.atlassian.com/browse/BSERV-10594 (Vendor Advisory)

Frequently asked questions

What is CVE-2017-18088?: CVE-2017-18088 is a medium-severity vulnerability in Atlassian Bitbucket, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2018-02-15.
How severe is CVE-2017-18088?: Medium severity. CVSS v3 base score is 4.3 out of 10.