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Fencer Intel
medium 6.5

CVE-2018-13796 json

Moderate severity vulnerability that affects mailman

published 8y ago modified 4mo ago also GHSA-xqvg-xm9m-p2c4 , PYSEC-2026-661 , EUVD-2018-0472

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.5%
EPSS 2.5% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

An issue was discovered in GNU Mailman before 2.1.28. A crafted URL can cause arbitrary text to be displayed on a web page from a trusted site.

Patch / fix

  • pypi mailman 2.1.28
  • gnu mailman 2.1.28
  • mailman Ubuntu 16.04 LTS 1:2.1.20-1ubuntu0.4
  • mailman Ubuntu 18.04 LTS 1:2.1.26-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2018-13796

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • mailman RHEL 7 3:2.1.15-30.el7

red hat advisories RHSA-2020:1054

  • mailman SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +2 more 2.1.15-9.6.6.1
  • mailman SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES for SAP 12 SP2 +9 more 2.1.17-3.3.3

suse advisories SUSE-SU-2019:13924-1SUSE-SU-2018:4296-1

Is CVE-2018-13796 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-13796 updated cvss 4.3

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

  • Red Hat Enterprise Linux 5 mailman Red Hat Enterprise Linux 6 mailman
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Server (v. 7) mailman 2.1.15-30.el7 Red Hat Enterprise Linux Workstation (v. 7) mailman 2.1.15-30.el7
    fixed: vendor fix RHSA-2020:1054
  • Red Hat Enterprise Linux 8 mailman
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.53% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N
GitHub 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
OSV 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
pypi mailman
<2.1.28
2.1.28

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.