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CVE-2018-11565

18
FAUCET Score

CVE-2018-11565 is a medium-severity information disclosure vulnerability affecting Mahara versions 17.04 before 17.04.8, 17.10 before 17.10.5, and 18.04 before 18.04.1. The flaw allows an unauthenticated attacker to enumerate valid usernames by observing differences in responses when attempting to register a username that is already taken. With a CVSS score of 5.3, this vulnerability has a low impact on confidentiality and requires no user interaction or privileges to exploit. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 17.04.0, < 17.04.8CPE matchmatch criteria
cpe:2.3:a:mahara:mahara:*:*:*:*:*:*:*:*
>= 17.10.0, < 17.10.5CPE matchmatch criteria
cpe:2.3:a:mahara:mahara:*:*:*:*:*:*:*:*
18.04.0CPE matchmatch criteria
cpe:2.3:a:mahara:mahara:18.04.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.89%
Probability of exploitation in next 30 days
EPSS Percentile
55.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0089 is in the 35th 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

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

bugs.launchpad.net / mahara/+bug/1772774
Issue TrackingPatchVendor Advisory
mahara.org / interaction/forum/topic.php
Vendor Advisory