NVD / CVE Program· CNA atlassian

CVE-2021-26086: Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a path traversal…

MediumCVSS 5.3 · v3.1KEVWeaponized No fix recorded

Noroxi assessment

Priority: Now (action score 81/100)

CISA has confirmed exploitation in the wild (Nov 12, 2024). Remediation deadline for US federal agencies: Dec 3, 2024.
A ready-made attack module is public (Nuclei); exploiting it takes no special expertise.
Probability of exploitation in the next 30 days: 99.9% (FIRST EPSS); higher than 99.9% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
According to the record, no fixed version is available yet.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Patch today or shut off access. Until a fix is released, restrict access to the affected component and follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

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.

Published: Aug 15, 2021
Updated: Jun 16, 2026
EPSS: 99.9% · 99th percentile
CWE: CWE-22

Report tools

JSON

Action score

Now

Patch today or shut off access.

CVSS: 21 / 40 · 5.3 / 10
CISA KEV: 30 / 30 · Listed
EPSS: 30 / 30 · 99.9%

CISA SSVC decision

Exploitation: active
Automatable: yes
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Nov 12, 2024. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Dec 3, 2024.

Get told when this record changes

In CISA KEV: exploitation in the wild confirmed
Weaponized exploit exists
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
atlassian	jira data center	cpe:2.3:a:atlassian:jira_data_center
atlassian	jira server	cpe:2.3:a:atlassian:jira_server

Versions reported by the vendor

Affected version ranges reported by the assigning authority (atlassian). Independent of NVD's CPE analysis and usually ahead of it.

Atlassian Jira Data Center
- unspecified and later · before 8.5.14affected
- 8.6.0 and later · before unspecifiedaffected
- unspecified and later · before 8.13.6affected
- 8.14.0 and later · before unspecifiedaffected
- unspecified and later · before 8.16.1affected
Atlassian Jira Server
- unspecified and later · before 8.5.14affected
- 8.6.0 and later · before unspecifiedaffected
- unspecified and later · before 8.13.6affected
- 8.14.0 and later · before unspecifiedaffected
- unspecified and later · before 8.16.1affected

Affected versions · NVD (6)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

atlassian jira data centerbefore 8.5.14
atlassian jira data center8.6.0 and later · before 8.13.6
atlassian jira data center8.14.0 and later · before 8.16.1
atlassian jira serverbefore 8.5.14
atlassian jira server8.6.0 and later · before 8.13.6
atlassian jira server8.14.0 and later · before 8.16.1

Same product

atlassian: all records

Other highest-scoring records for the same primary product.

CVE-2022-0540A vulnerability in Jira Seraph allows a remote, unauthenticated attacker to bypass authentication by sending a specially crafted HTTP…
65This week
CVE-2020-36239Jira Data Center, Jira Core Data Center, Jira Software Data Center from version 6.3.0 before 8.5.16, from 8.6.0 before 8.13.8, from 8.14.0…
54Plan
CVE-2022-26135A vulnerability in Mobile Plugin for Jira Data Center and Server allows a remote, authenticated user (including a user who joined via the…
47Plan

Published before and after this one in the same product

← EarlierCVE-2020-14179Sep 20, 2020 · Affected versions of Atlassian Jira Server and Data Center allow remote, unauthenticated attackers to view custom field names and custom…
44Plan
← EarlierCVE-2021-26080Jun 7, 2021 · EditworkflowScheme.jspa in Jira Server and Jira Data Center before version 8.5.14, and from version 8.6.0 before version 8.13.6, and from 8.
24Monitor
Later →CVE-2021-39116Sep 7, 2021 · Affected versions of Atlassian Jira Server and Data Center allow remote attackers to impact the application's availability via a Denial of…
22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

Exploit-DB entry ×1
Nuclei detection template ×1
Proof-of-concept repository on GitHub ×3

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
Source	Kind	Date
Proof-of-concept repository on GitHub	3 repositories	2021-09-05 → 2021-11-16
Exploit-DB entry	webapps	2021-10-06
Nuclei detection template	Nuclei template CVE-2021-26086	—

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedAug 15, 2021
First PoCSep 5, 2021+20 d
CISA KEVNov 12, 2024+1184 d
TodayNov 14, 2026+1916 d

Bug bounty scope

AtlassianBugcrowd · paid · up to $12,000

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-21-0841 · Oct 15, 2021( Jira Server Güvenlik Zafiyeti)

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: low · data can be read
Integrity: none
Availability: none

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: Low
Integrity impact: None
Availability impact: None

Weakness class (CWE)

CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

nvd-primary

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

The bug in code

The whole CWE-22 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1const file = path.join(ROOT, req.query.name);
2res.sendFile(file);

Fixed

1const file = path.resolve(ROOT, req.query.name);
2if (!file.startsWith(ROOT + path.sep)) {
3  return res.sendStatus(400);
4}
5res.sendFile(file);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log (0)

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

jira.atlassian.com/browse/JRASERVER-72695

Show all references (1 more)

www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26086

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records

Noroxi analysis

What does it mean in your environment?

We use this product, ask for help

Data sources and verification

CNA: atlassian

CVE.org (CNA)Oct 21, 2025, 11:25 PM UTC
CISA ADPOct 21, 2025, 11:25 PM UTC
NVDJun 16, 2026, 11:42 PM UTC
FIRST EPSSOct 25, 2026, 12:00 AM UTC
Exploit-DBNov 13, 2026, 3:17 AM UTC
NucleiNov 13, 2026, 3:18 AM UTC
PoC-in-GitHubNov 13, 2026, 3:18 AM UTC

Each line is when that source was last processed for this record.