medium Known exploitedREV. 01
CVE-2021-26086Atlassian Jira — Path Traversal File Read in Web Descriptor Endpoint
Affected Jira Server and Data Center releases let an unauthenticated attacker read particular files off the server through a path traversal in one of the application's web endpoints. Reading only — but the deployment descriptor is one of the files.
Read the risk
THE VITAL STATS- CVSS score
- 5.3/ 10 CVSS v3.1
- EPSS probability
- 100% Likelihood of exploitation
- Attack complexity
- Low Conditions needed to exploit
- Known exploited
- Yes — CISA KEV
- CVE published
- 2021-08-16
- Added to KEV
- 2024-11-12
- Exploit published
- Yes
- Confidence
- high
- Kill chain
- initial access
- MITRE ATT&CK
- T1190
- Severity
- medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attacker needsNetwork access to a Jira Server or Data Center instance in an affected version range. No credentials needed.
Fixed inJira 8.5.14, Jira 8.13.6, Jira 8.16.1
Behind the card
4 REFERENCES- 01CVE recordNVD recordnvd.nist.gov
- 02Vendor advisoryAtlassian issue JRASERVER-72695jira.atlassian.com
- 03ExploitPublic file-read exploitpacketstormsecurity.com
- 04CISACISA Known Exploited Vulnerabilities entrycisa.gov
Field-level provenanceTRACE THE SOURCES +
Which source supports each field, when it was retrieved, and who extracted it.
| Fields | Source | Retrieved | Extractor | Confidence |
|---|---|---|---|---|
| title, summary, cvss, severity, exploitation.attack_complexity, exploitation.prerequisites, exploitation.exploit_available, remediation, references | nvd.nist.gov | 2026-08-07 | claude-code | high |
| exploitation.known_exploited | cisa.gov | 2026-08-07 | claude-code | high |
| epss | api.first.org | 2026-08-07 | claude-code | high |
Printing history
THE RECORD- r1Initial base card
First printing. This card has not been reprinted since publication.