CVE-2020-4022 — The attachment download resource in Atlassian Jira Server and Data Center before 8.5.5, and from 8.6.0 before 8.8.2, and from 8.9.0 before 8.9.1 allows remote attackers to inject arbitrary HTML or JavaScript via a Cross-Site Scripting (XSS) vulnerability issue attachments with a mixed multipart content type

Back Back to CVE browser

MEDIUM

The attachment download resource in Atlassian Jira Server and Data Center before 8.5.5, and from 8.6.0 before 8.8.2, and from 8.9.0 before 8.9.1 allows remote attackers to inject arbitrary HTML or JavaScript via a Cross-Site Scripting (XSS) vulnerability issue attachments with a mixed multipart content type

Published Jul 1, 2020

6.1

MEDIUM

CVSS 3.1

EPSS 1.14%

Description

The attachment download resource in Atlassian Jira Server and Data Center before 8.5.5, and from 8.6.0 before 8.8.2, and from 8.9.0 before 8.9.1 allows remote attackers to inject arbitrary HTML or JavaScript via a Cross-Site Scripting (XSS) vulnerability issue attachments with a mixed multipart content type.

Affected products

Vendor Atlassian Product Jira Server and Data Center Default
n/a
- Version
  8.6.0
  Status
  affected
  Constraints
  <unspecified
- Version
  8.9.0
  Status
  affected
  Constraints
  <unspecified
- Version
  unspecified
  Status
  affected
  Constraints
  <8.5.5
- Version
  unspecified
  Status
  affected
  Constraints
  <8.8.2
- Version
  unspecified
  Status
  affected
  Constraints
  <8.9.1

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Atlassian

Jira Server and Data Center

n/a

Version	Status	Constraints
8.6.0	affected	<unspecified
8.9.0	affected	<unspecified
unspecified	affected	<8.5.5
unspecified	affected	<8.8.2
unspecified	affected	<8.9.1

Remediation

No remediation recorded yet.

Metrics

1.14% 0.01135

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.

EPSS probability 0.01135

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Table of values (11 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 3, 2026	1.14% (0.01135)	65.35th	v5 (v2026.06.15)
Sep 20, 2026	1.14% (0.01135)	65.05th	v5 (v2026.06.15)
Jul 20, 2024	0.11% (0.00113)	45.21th	v3 (v2023.03.01)
Sep 3, 2023	0.11% (0.00113)	44.03th	v3 (v2023.03.01)
Mar 7, 2023	0.10% (0.00103)	40.66th	v3 (v2023.03.01)
Mar 6, 2023	1.05% (0.01055)	52.13th	v2 (v2022.01.01)
Apr 1, 2022	1.05% (0.01055)	48.43th	v2 (v2022.01.01)
Mar 31, 2022	2.56% (0.02561)	62.63th	v2 (v2022.01.01)
Jan 6, 2022	2.30% (0.02304)	53.25th	v1
Jan 5, 2022	0.52% (0.00523)	33.47th	v5 (v2026.06.15)
Apr 14, 2021	0.52% (0.00523)	0.00th	v1