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CVE-2018-13796

24
FAUCET Score

CVE-2018-13796 is a medium-severity vulnerability affecting GNU Mailman versions prior to 2.1.28. It allows an attacker to inject arbitrary text onto a trusted webpage through a specially crafted URL, potentially leading to defacement or phishing. The attack requires user interaction (UI:R) but can be executed remotely (AV:N) with low complexity (AC:L), resulting in a high impact to integrity (I:H) without affecting confidentiality or availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.1.28CPE matchmatch criteria
cpe:2.3:a:gnu:mailman:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.54%
Probability of exploitation in next 30 days
EPSS Percentile
83.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0254 is in the 92nd percentile among its peer group of 26,219 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

pippatch availablevia ghsa
Product: mailmanFixed in: 2.1.28
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: mailman-3:2.1.15-30.el7
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: mailman
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: mailman

Vendor Advisories (2)

pipGHSA-xqvg-xm9m-p2c4medium

Moderate severity vulnerability that affects mailman

Sep 11, 2018
redhatCVE-2018-13796Moderate

mailman: Mishandled URLs in Utils.py:GetPathPieces() allows attackers to display arbitrary text on trusted sites

Jul 23, 2018

References

bugs.launchpad.net / mailman/+bug/1780874
Issue TrackingThird Party Advisory
lists.debian.org / debian-lts-announce/2018/07/msg00034.html
Mailing ListThird Party Advisory
security.gentoo.org / glsa/201904-10
Third Party Advisory
usn.ubuntu.com / 4348-1
mail-archive.com / mailman-users%40python.org/msg71003.html