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Fencer Vulns
medium 6.1

CVE-2019-16935 json

The documentation XML-RPC server in Python through 2.7.16, 3.x through 3.6.9, and 3.7.x through 3.7.4 has XSS via the server_title field.

published 2019-09-28 7 y ago modified 2026-10-07 32 d ago also EUVD-2019-7426

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
4.7%
EPSS 4.7% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

The documentation XML-RPC server in Python through 2.7.16, 3.x through 3.6.9, and 3.7.x through 3.7.4 has XSS via the server_title field. This occurs in Lib/DocXMLRPCServer.py in Python 2.x, and in Lib/xmlrpc/server.py in Python 3.x. If set_server_title is called with untrusted input, arbitrary JavaScript can be delivered to clients that visit the http URL for this server.

Patch / fix

  • python python 2.7.17, 3.5.8, 3.6.10, 3.7.5
  • jython Debian 14, Debian 13, Debian 12 2.7.2+repack1-5

debian advisories DEBIAN-CVE-2019-16935

  • python2.7 Ubuntu 16.04 LTS 2.7.12-1ubuntu0~16.04.9
  • python2.7 Ubuntu 18.04 LTS 2.7.15-4ubuntu4~18.04.2
  • python3.5 Ubuntu 16.04 LTS 3.5.2-2ubuntu0~16.04.9
  • python3.6 Ubuntu 18.04 LTS 3.6.8-1~18.04.3
  • python2.7 Ubuntu Pro 14.04 LTS 2.7.6-8ubuntu0.6+esm3
  • python3.4 Ubuntu Pro 14.04 LTS 3.4.3-1ubuntu1~14.04.7+esm4
  • python3.5 Ubuntu Pro 14.04 LTS 3.5.2-2ubuntu0~16.04.4~14.04.1+esm1

ubuntu advisories UBUNTU-CVE-2019-16935

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

  • pytz RHEL 8 2017.2-12.module+el8.1.0+3111+de3f2d8e
  • babel RHEL 8 2.5.1-9.module+el8.1.0+3111+de3f2d8e
  • numpy RHEL 8 1:1.14.2-13.module+el8.1.0+3323+7ac3e00f
  • scipy RHEL 8 1.0.0-20.module+el8.1.0+3323+7ac3e00f
  • Cython RHEL 8 0.28.1-7.module+el8.1.0+3111+de3f2d8e
  • pytest RHEL 8 3.4.2-13.module+el8.1.0+3111+de3f2d8e
  • PyYAML RHEL 8 3.12-16.module+el8.1.0+3111+de3f2d8e
  • python2 RHEL 8 2.7.17-1.module+el8.2.0+4561+f4e0d66a

red hat advisories RHSA-2020:1605RHSA-2020:4285RHSA-2020:3888RHSA-2020:4433RHSA-2020:3911

  • python3 SLES for SAP 15, SLES 15-LTSS, SLE Module for Basesystem 15 SP2 +3 more 3.6.12-3.67.2
  • python3-core SLES for SAP 15, SLES 15-LTSS, SLE Module for Development Tools 15 SP2 +5 more 3.6.12-3.67.2
  • python3 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +16 more 3.4.10-25.52.1
  • python3-base SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +16 more 3.4.10-25.52.1
  • python SLE Module for Python 2 15 SP1, SLE Module for Desktop Applications 15 SP1, SLE Module for Desktop Applications 15 +2 more 2.7.17-7.32.2
  • python-base SLE Module for Python 2 15 SP1, SLE Module for Basesystem 15 SP1, SLE Module for Basesystem 15 2.7.17-7.32.1
  • python3 SLE Module for Basesystem 15 SP1, SLE Module for Basesystem 15 3.6.10-3.42.2
  • python3-base SLE Module for Development Tools 15 SP1, SLE Module for Development Tools 15, SLE Module for Basesystem 15 SP1 +1 more 3.6.10-3.42.2

suse advisories SUSE-SU-2020:3930-1SUSE-SU-2020:2699-1SUSE-SU-2020:0234-1SUSE-SU-2020:0114-1SUSE-SU-2019:2748-2SUSE-SU-2019:2802-1

  • python openSUSE Tumbleweed 2.7.18-8.1
  • python36 openSUSE Tumbleweed 3.6.15-1.1
  • python3 openSUSE Leap 15.1 3.6.12-lp151.6.32.1
  • python3-core openSUSE Leap 15.1 3.6.12-lp151.6.32.1
  • python3-documentation openSUSE Leap 15.1 3.6.12-lp151.6.32.1
  • python3 openSUSE Leap 15.2 3.6.12-lp152.4.14.1
  • python3-core openSUSE Leap 15.2 3.6.12-lp152.4.14.1
  • python3-documentation openSUSE Leap 15.2 3.6.12-lp152.4.14.1

opensuse advisories openSUSE-SU-2024:11202-1openSUSE-SU-2024:11284-1openSUSE-SU-2020:2333-1openSUSE-SU-2020:2332-1openSUSE-SU-2020:0086-1openSUSE-SU-2019:2453-1

  • python2-py AlmaLinux 8 1.5.3-6.module_el8.6.0+2781+fed64c13
  • python2-dns AlmaLinux 8 1.15.0-10.module_el8.6.0+2781+fed64c13
  • python2-idna AlmaLinux 8 2.5-7.module_el8.6.0+2781+fed64c13
  • python2-mock AlmaLinux 8 2.0.0-13.module_el8.6.0+2781+fed64c13
  • python2-pytz AlmaLinux 8 2017.2-12.module_el8.6.0+2781+fed64c13
  • python2-attrs AlmaLinux 8 17.4.0-10.module_el8.6.0+2781+fed64c13
  • python2-Cython AlmaLinux 8 0.28.1-7.module_el8.6.0+2781+fed64c13
  • python2-pluggy AlmaLinux 8 0.6.0-8.module_el8.6.0+2781+fed64c13

almalinux advisories ALSA-2020:1605

  • pytz Rocky Linux 8 2017.2-12.module+el8.5.0+706+735ec4b3
  • pytz Rocky Linux 8 2017.2-12.module+el8.4.0+403+9ae17a31
  • babel Rocky Linux 8 2.5.1-9.module+el8.4.0+403+9ae17a31
  • scipy Rocky Linux 8 1.0.0-20.module+el8.3.0+120+426d8baf
  • Cython Rocky Linux 8 0.28.1-7.module+el8.5.0+706+735ec4b3
  • Cython Rocky Linux 8 0.28.1-7.module+el8.4.0+403+9ae17a31
  • pytest Rocky Linux 8 3.4.2-13.module+el8.5.0+706+735ec4b3
  • pytest Rocky Linux 8 3.4.2-13.module+el8.4.0+403+9ae17a31

rocky linux advisories RLSA-2020:1605

  • python2 Alpine 3.15, Alpine 3.14, Alpine 3.13 +2 more 2.7.16-r3
  • python3 Alpine 3.24, Alpine 3.23, Alpine 3.22 +12 more 3.7.5-r0
  • python3 Alpine 3.8, Alpine 3.7 3.6.9-r1
  • python3 Alpine 3.9 3.6.9-r2
  • python2-tkinter Alpine 3.11, Alpine 3.10 2.7.17-r0

alpine advisories ALPINE-CVE-2019-16935

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2019-16935 updated cvss 6.1

python: XSS vulnerability in the documentation XML-RPC server in server_title field

  • Red Hat Enterprise Linux 5 python Red Hat Enterprise Linux 6 python, tkinter, python-libs, python-test, python-tools
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Do 1 openshiftdo/odo-init-image-rhel7 1.1.3-2
    fixed: vendor fix RHSA-2021:0949
  • Red Hat Enterprise Linux AppStream (v. 8) python3-idle 3.6.8-31.el8, python3-test 3.6.8-31.el8, platform-python 3.6.8-31.el8, python3-tkinter 3.6.8-31.el8, babel 2.5.1-9.module+el8.1.0+3111+de3f2d8e, pytz 2017.2-12.module+el8.1.0+3111+de3f2d8e, +88 more
    fixed: vendor fix RHSA-2020:1605
  • Red Hat Enterprise Linux BaseOS (v. 8) python3 3.6.8-31.el8, python3-libs 3.6.8-31.el8, python3-test 3.6.8-31.el8, platform-python 3.6.8-31.el8
    fixed: vendor fix RHSA-2020:4433
  • Red Hat Enterprise Linux Client (v. 7) python 2.7.5-89.el7, python3 3.6.8-17.el7, python-libs 2.7.5-89.el7, python3-libs 3.6.8-17.el7 Red Hat Enterprise Linux Client Optional (v. 7) python3 3.6.8-17.el7, tkinter 2.7.5-89.el7, python-test 2.7.5-89.el7, python-tools 2.7.5-89.el7, python3-idle 3.6.8-17.el7, python3-test 3.6.8-17.el7, +1 more Red Hat Enterprise Linux ComputeNode (v. 7) python 2.7.5-89.el7, python3 3.6.8-17.el7, python-libs 2.7.5-89.el7, python3-libs 3.6.8-17.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) python3 3.6.8-17.el7, tkinter 2.7.5-89.el7, python-test 2.7.5-89.el7, python-tools 2.7.5-89.el7, python3-idle 3.6.8-17.el7, python3-test 3.6.8-17.el7, +1 more Red Hat Enterprise Linux Server (v. 7) python 2.7.5-89.el7, python3 3.6.8-17.el7, python-libs 2.7.5-89.el7, python3-libs 3.6.8-17.el7 Red Hat Enterprise Linux Server Optional (v. 7) python3 3.6.8-17.el7, tkinter 2.7.5-89.el7, python-test 2.7.5-89.el7, python-tools 2.7.5-89.el7, python3-idle 3.6.8-17.el7, python3-test 3.6.8-17.el7, +1 more
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) python 2.7.5-89.el7, python3 3.6.8-17.el7, python-libs 2.7.5-89.el7, python3-libs 3.6.8-17.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) python3 3.6.8-17.el7, tkinter 2.7.5-89.el7, python-test 2.7.5-89.el7, python-tools 2.7.5-89.el7, python3-idle 3.6.8-17.el7, python3-test 3.6.8-17.el7, +1 more
    fixed: vendor fix RHSA-2020:3911
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) rh-python36-python 3.6.12-1.el6, rh-python36-python-pip 9.0.1-5.el6, rh-python36-python-libs 3.6.12-1.el6, rh-python36-python-test 3.6.12-1.el6, rh-python36-python-tools 3.6.12-1.el6, rh-python36-python-tkinter 3.6.12-1.el6, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-python36-python 3.6.12-1.el7, rh-python36-python-pip 9.0.1-5.el7, rh-python36-python-libs 3.6.12-1.el7, rh-python36-python-test 3.6.12-1.el7, rh-python36-python-tools 3.6.12-1.el7, rh-python36-python-tkinter 3.6.12-1.el7, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) rh-python36-python 3.6.12-1.el7, rh-python36-python-pip 9.0.1-5.el7, rh-python36-python-libs 3.6.12-1.el7, rh-python36-python-test 3.6.12-1.el7, rh-python36-python-tools 3.6.12-1.el7, rh-python36-python-tkinter 3.6.12-1.el7, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-python36-python 3.6.12-1.el7, rh-python36-python-pip 9.0.1-5.el7, rh-python36-python-libs 3.6.12-1.el7, rh-python36-python-test 3.6.12-1.el7, rh-python36-python-tools 3.6.12-1.el7, rh-python36-python-tkinter 3.6.12-1.el7, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) rh-python36-python 3.6.12-1.el6, rh-python36-python-pip 9.0.1-5.el6, rh-python36-python-libs 3.6.12-1.el6, rh-python36-python-test 3.6.12-1.el6, rh-python36-python-tools 3.6.12-1.el6, rh-python36-python-tkinter 3.6.12-1.el6, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-python36-python 3.6.12-1.el7, rh-python36-python-pip 9.0.1-5.el7, rh-python36-python-libs 3.6.12-1.el7, rh-python36-python-test 3.6.12-1.el7, rh-python36-python-tools 3.6.12-1.el7, rh-python36-python-tkinter 3.6.12-1.el7, +1 more
    fixed: vendor fix RHSA-2020:4285
  • Red Hat Enterprise Linux 8 scipy, python36, python-nose, python-wheel, python3-bson, python3-nose, +19 more Red Hat Software Collections python27-python, python27-tkinter, python27-python-libs, python27-python-test, python27-python-tools
    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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
32 d ago

Exploit prediction

4.65% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/python/cpython/pull/16373 referenced PoC, tagged "exploit" by a source, unverified
  • bugs.python.org https://bugs.python.org/issue38243 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA 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.