CVE-2020-8031

obs: Stored XSS

6.3 MediumFix available

A Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Open Build Service allows remote attackers to store JS code in markdown that is not properly escaped, impacting confidentiality and integrity. This issue affects: Open Build Service versions prior to 2.10.8.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: Low
Availability: None

Exploit likelihood

0.75%Up 0.2 points since Apr 14, 2021

What each source reports

CVE List Score used 6.3

obs: Stored XSS

Record: CVE-2020-8031
CVSS 3.1: 6.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2020-28943 6.3

Record: EUVD-2020-28943
CVSS 3.1: 6.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
Updated: 2026-11-03

GitHub AdvisoriesGHSA-6g6q-c7q8-8r7m No score

A Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')...

Record: GHSA-6g6q-c7q8-8r7m
Weakness: CWE-79
Updated: 2026-11-02

NVD 6.3

Record: CVE-2020-8031
CVSS 3.1: 6.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 3.5 LowAV:N/AC:M/Au:S/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 5.4

Record: CVE-2020-8031
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVDEBIAN-CVE-2020-8031 5.4

Record: DEBIAN-CVE-2020-8031
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVOESA-2022-1577 5.4

obs-server security update

Security Fix(es):

Record: OESA-2022-1577
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2020-8031 6.3

Record: UBUNTU-CVE-2020-8031
CVSS 3.1: 6.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`open-build-service` Debian:12	before 2.9.4-4	2.9.4-4
`obs-server` openEuler:20.03-LTS-SP1	before 2.10.11-1.oe1	2.10.11-1.oe1
`obs-server` openEuler:20.03-LTS-SP2	before 2.10.11-1.oe1	2.10.11-1.oe1
`obs-server` openEuler:20.03-LTS-SP3	before 2.10.11-1.oe1	2.10.11-1.oe1
`open-build-service` Ubuntu:18.04:LTS	All versions, plus listed versions 2.7.4-2	None known
`open-build-service` Ubuntu:24.04:LTS	All versions, plus listed versions 2.9.4-92.9.4-10	None known
`open-build-service` Ubuntu:25.10	All versions, plus listed versions 2.9.4-10	None known
`open-build-service` Ubuntu:26.04:LTS	All versions, plus listed versions 2.9.4-10	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, products, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-8031 is a medium vulnerability (CVSS 6.3) in Opensuse Open Build Service, published February 11, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.75%, the 55th percentile. Fixed in open-build-service 2.9.4-4.