CVE-2021-26086 (GCVE-0-2021-26086)
Vulnerability from cvelistv5 – Published: 2021-08-16 00:15 – Updated: 2025-10-21 23:25Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-11-13 14:08 UTC
CWE
- Path Traversal
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://jira.atlassian.com/browse/JRASERVER-72695 | x_refsource_MISC |
| http://packetstormsecurity.com/files/164405/Atlas… | x_refsource_MISC |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
4 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Atlassian | Jira Server |
Affected:
unspecified , < 8.5.14
(custom)
Affected: 8.6.0 , < unspecified (custom) Affected: unspecified , < 8.13.6 (custom) Affected: 8.14.0 , < unspecified (custom) Affected: unspecified , < 8.16.1 (custom) |
guessed | |
| Atlassian | Jira Data Center |
Affected:
unspecified , < 8.5.14
(custom)
Affected: 8.6.0 , < unspecified (custom) Affected: unspecified , < 8.13.6 (custom) Affected: 8.14.0 , < unspecified (custom) Affected: unspecified , < 8.16.1 (custom) |
guessed | |
| atlassian | jira_server |
Affected:
0 , < 8.5.14
(custom)
Affected: 8.6.0 , < 8.13.6 (custom) Affected: 8.14.0 , < 8.16.1 (custom) cpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:* |
||
| atlassian | jira_data_center |
Affected:
0 , < 8.5.14
(custom)
Affected: 8.6.0 , < 8.13.6 (custom) Affected: 8.14.0 , < 8.16.1 (custom) cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:* |
Date Public
2021-08-12 00:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 2592f644-6a45-42f8-8391-3c6da369e26e
Exploited: Yes
Timestamps
First Seen: 2024-11-12
Asserted: 2024-11-12
Scope
Notes: KEV entry: Atlassian Jira Server and Data Center Path Traversal Vulnerability | Affected: Atlassian / Jira Server and Data Center | Description: Atlassian Jira Server and Data Center contain a path traversal vulnerability that allows a remote attacker to read particular files in the /WEB-INF/web.xml endpoint. | Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. | Due date: 2024-12-03 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://jira.atlassian.com/browse/JRASERVER-72695 ; https://nvd.nist.gov/vuln/detail/CVE-2021-26086
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-22 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Jira Server and Data Center |
| Due Date | 2024-12-03 |
| Date Added | 2024-11-12 |
| Vendorproject | Atlassian |
| Vulnerabilityname | Atlassian Jira Server and Data Center Path Traversal Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-02-02 12:26 UTC
| Updated: 2026-02-06 07:17 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 25789e8f-9bec-4918-a194-ec7c5f578b8c
Exploited: Yes
Characteristics
Severity:
53.0
Timestamps
First Seen: 2023-10-26
Asserted: 2023-10-26
Last Seen: 2026-07-20
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Atlassian / JIRA | Class: other-software | Severity: Medium (CVSS 5.3) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-07-20: 36
Evidence
Type: Honeypot
Signal: In The Wild Attempts
Confidence: 70%
Source: shadowserver
Details
| 1D | 6 |
|---|---|
| Iot | no |
| Feed | Shadowserver Foundation honeypot/exploited-vulnerabilities |
| Type | http-scan |
| Class | other-software |
| 7D Avg | 1 |
| Vendor | Atlassian |
| 30D Avg | 1 |
| 90D Avg | 0 |
| Product | JIRA |
| Cisa Kev | yes |
| Connections | 36 |
| Observation Date | 2026-07-20 |
| Vulnerability Class | CVSS |
| Vulnerability Score | 5.3 |
| Vulnerability Severity | Medium |
References
Created: 2026-06-30 09:23 UTC
| Updated: 2026-07-22 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: b194c971-f778-4898-b3f5-e356740ff9d3
Exploited: Yes
Timestamps
First Seen: 2024-11-12
Asserted: 2024-11-12
Scope
Notes: KEVIntel entry: Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a path traversal vulnerability in... | Affected: Atlassian / Jira Server, Jira Data Center | CVSS: 5.3 (MEDIUM) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a path traversal vulnerability in... |
| Vendor | Atlassian |
| Product | Jira Server, Jira Data Center |
| Added Date | 2024-11-12T00:00:00.000Z |
| Cvss Score | 5.3 |
| Epss Score | None |
| Cvss Severity | MEDIUM |
| Epss Percentile | None |
| Used In Malware | unknown |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 14:06 UTC
| Updated: 2026-07-10 06:14 UTC
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"refsource": "MISC",
"url": "http://packetstormsecurity.com/files/164405/Atlassian-Jira-Server-Data-Center-8.4.0-File-Read.html"
}
]
}
}
}
},
"cveMetadata": {
"assignerOrgId": "f08a6ab8-ed46-4c22-8884-d911ccfe3c66",
"assignerShortName": "atlassian",
"cveId": "CVE-2021-26086",
"datePublished": "2021-08-16T00:15:09.827Z",
"dateReserved": "2021-01-25T00:00:00.000Z",
"dateUpdated": "2025-10-21T23:25:37.960Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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