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CVE-2018-0489

22
FAUCET Score

CVE-2018-0489 is a digital signature bypass vulnerability in Shibboleth XMLTooling-C before 1.6.4, affecting Shibboleth Service Provider on Windows and other products like Aruba ClearPass and Debian. This medium-severity flaw (CVSS 6.5) allows remote attackers to obtain sensitive information or impersonate users via crafted XML data, stemming from an incomplete fix for a previous vulnerability. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion and media coverage, indicating awareness within the security community.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.6.4CPE matchmatch criteria
cpe:2.3:a:shibboleth:xmltooling-c:*:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
>= 6.6.0, <= 6.6.9CPE matchmatch criteria
cpe:2.3:a:arubanetworks:clearpass:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
2.5
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.15%
Probability of exploitation in next 30 days
EPSS Percentile
80.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0215 is in the 69th percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2018-0489Important

openSAML: Mishandling of comments in SAML content can lead to bypass of signature verification

Feb 27, 2018

References

lists.debian.org / debian-lts-announce/2018/02/msg00031.html
Issue Tracking
shibboleth.net / community/advisories/secadv_20180227.txt
PatchVendor Advisory
debian.org / security/2018/dsa-4126
Third Party Advisory
arubanetworks.com / assets/alert/ARUBA-PSA-2018-003.txt
Third Party Advisory
securityfocus.com / bid/103172
Third Party AdvisoryVDB Entry
securitytracker.com / id/1040435
Third Party AdvisoryVDB Entry