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Fencer Vulns
medium 6.1

CVE-2018-5950 json

Cross-site scripting (XSS) vulnerability in the web UI in Mailman before 2.1.26 allows remote attackers to inject arbitrary web script or H…

published 2018-01-23 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-17717

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.6%
EPSS 4.6% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

Cross-site scripting (XSS) vulnerability in the web UI in Mailman before 2.1.26 allows remote attackers to inject arbitrary web script or HTML via a user-options URL.

Patch / fix

  • gnu mailman 2.1.26
  • mailman Ubuntu 14.04 LTS 1:2.1.16-2ubuntu0.5
  • mailman Ubuntu 16.04 LTS 1:2.1.20-1ubuntu0.3

ubuntu advisories UBUNTU-CVE-2018-5950

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 6 3:2.1.12-26.el6_9.3
  • mailman RHEL 7 3:2.1.15-26.el7_4.1

red hat advisories RHSA-2018:0504RHSA-2018:0505

  • 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

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-2018-5950 updated cvss 6.1

mailman: Cross-site scripting (XSS) vulnerability in web UI

  • Red Hat Enterprise Linux 5 mailman
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) mailman 2.1.15-26.el7_4.1
    fixed: vendor fix RHSA-2018:0505
  • Red Hat Enterprise Linux Server (v. 6) mailman 2.1.12-26.el6_9.3
    fixed: vendor fix RHSA-2018:0504
  • Red Hat Enterprise Linux Server (v. 7) mailman 2.1.15-26.el7_4.1
    fixed: vendor fix RHSA-2018:0505
  • Red Hat Enterprise Linux Workstation (v. 6) mailman 2.1.12-26.el6_9.3
    fixed: vendor fix RHSA-2018:0504
  • Red Hat Enterprise Linux Workstation (v. 7) mailman 2.1.15-26.el7_4.1
    fixed: vendor fix RHSA-2018:0505
  • 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

4.57% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • packetstormsecurity.com http://packetstormsecurity.com/files/159761/Mailman-2.1.23-Cross-Site-Scripting.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns 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.