CVE-2021-26086

mediumpriority · act · 90OT risk · criticalKEV · exploitedEPSS 1.000 · 100 %ileexploit · PoCEUUS

grimoire priorityP0 · Act now

Exploitable?

Yes · in the wild

CISA KEV · 4 exploits · PoC

Likely / severe?

100.0% (100th) EPSS

CVSS 5 · medium

Is it mine?

16 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

added 2024-11-12remediate by 2024-12-03

required action Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

EPSS · scored 2026-10-27

Atlassian Jira Server and Data Center Path Traversal Vulnerability

Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a path traversal vulnerability in the /WEB-INF/web.xml endpoint. The affected versions are before version 8.5.14, from version 8.6.0 before 8.13.6, and from version 8.14.0 before 8.16.1.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · ENISA EU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondaryexploitability 3.9 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:Hsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: active · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-22USprimary

exploits (4)

Public proof-of-concept and weaponised exploit code.

EDB-50380Atlassian Jira Server Data Center 8.16.0 - Arbitrary File ReadPoC · exploit_db
ColdFusionX/CVE-2021-26086Atlassian Jira Server/Data Center 8.4.0 - Arbitrary File read (CVE-2021-26086)PoC · poc_in_github
Jeromeyoung/CVE-2021-26086Confluence OGNL Injection [CVE-2021-26084].PoC · poc_in_github
Official-BlackHat13/CVE-2021-26086Confluence server webwork OGNL injectionPoC · poc_in_github

affected products (16)

Products and version ranges known to be affected.

Atlassian Jira Data Center8.14.0 → unspecifiedenisa_euvdEU
Atlassian Jira Data Center8.6.0 → unspecifiedenisa_euvdEU
Atlassian Jira Data Centerunspecified → 8.13.6enisa_euvdEU
Atlassian Jira Data Centerunspecified → 8.16.1enisa_euvdEU
Atlassian Jira Data Centerunspecified → 8.5.14enisa_euvdEU
Atlassian Jira Server8.14.0 → unspecifiedenisa_euvdEU
Atlassian Jira Server8.6.0 → unspecifiedenisa_euvdEU
Atlassian Jira Serverunspecified → 8.13.6enisa_euvdEU
Atlassian Jira Serverunspecified → 8.16.1enisa_euvdEU
Atlassian Jira Serverunspecified → 8.5.14enisa_euvdEU
atlassian jira data center< 8.5.14nvdUScpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*
atlassian jira data center8.14.0 → 8.16.1nvdUScpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*
atlassian jira data center8.6.0 → 8.13.6nvdUScpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*
atlassian jira server< 8.5.14nvdUScpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:*
atlassian jira server8.14.0 → 8.16.1nvdUScpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:*
atlassian jira server8.6.0 → 8.13.6nvdUScpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2021-08-16modified 2026-06-17

related (12,528)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2026-104286US	—OT critical	4.57% (92nd)	KEV	2026-10-01
An improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail 7.6.0 through 7.6.6, FortiMail…
CVE-2026-93616US	—OT critical	91.6% (100th)	KEV	2026-09-22
A directory traversal and file upload vulnerability allows an unauthenticated attacker to upload and execute arbitrary scripts on Check Point Management Server.
CVE-2026-85706US	—OT critical	97.4% (100th)	KEV	2026-09-12
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.7 before 18.11.12, 19.0 before 19.0.9, 19.1 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2…
CVE-2026-66384US	—OT critical	0.66% (52nd)	KEV	2026-08-12
An authenticated user may write data outside the intended Docker cache path under specific remote-repository conditions.
CVE-2026-59310US	—OT critical	2.56% (85th)	KEV	2026-07-30
VMware vCenter contains a directory traversal vulnerability in the Syslog server. A malicious actor with network access to vCenter may exploit this issue to execute arbitrary code.

+12523 more

references (10)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan