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ExploitedIn CISA KEVFix available

CVE-2021-26086

Exploitation confirmed. First attested on 2023-10-26 by CISA-ADP, CISA KEV, GCVE · kevintel, GCVE · shadowserver.

  • Published2021-08-16
  • Fixed in8.16.1 · 8.13.6 · 8.5.14
  • WeaknessCWE-22

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2021-08-1601:15CVE publishedNVD
  2. 2021-10-06Exploit-DB entryExploit-DB
  3. 2023-10-2623:27Listed as exploited by GCVEGCVE
  4. 2023-10-2623:27Exploitation first reportedGCVE
  5. 2024-11-12Added to the CISA KEV catalogCISA KEV
  6. 2024-11-1314:08SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-02 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-26086?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-26086?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · CISA-ADP
Atlassian Jira
BranchAffectedFixed in
8.x≥ 8.14.0, < 8.16.18.16.1
8.x≥ 8.6.0, < 8.13.68.13.6
8.5< 8.5.148.5.14
Atlassian Jira
BranchAffectedFixed in
8.x≥ 8.14.0, < 8.16.18.16.1
8.x≥ 8.6.0, < 8.13.68.13.6
8.5< 8.5.148.5.14

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA2 products

As atlassian, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Atlassian Jira Server
    Affected
    • < 8.5.14fixed in 8.5.14custom
    • = 8.6.0no fix statedcustom
    • < 8.13.6fixed in 8.13.6custom
    • = 8.14.0no fix statedcustom
    • < 8.16.1fixed in 8.16.1custom
  • Atlassian Jira Data Center
    Affected
    • < 8.5.14fixed in 8.5.14custom
    • = 8.6.0no fix statedcustom
    • < 8.13.6fixed in 8.13.6custom
    • = 8.14.0no fix statedcustom
    • < 8.16.1fixed in 8.16.1custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2021-10-05

Fix

  1. Update Atlassian Jira to 8.16.1 · 8.13.6 · 8.5.14
  2. CISA’s required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.due 2024-12-03

Advisories and patches

Detection

read 2026-11-01 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
EDB-50380
Exploit-DB
Proof-of-concept repositories
3 repositories, unverifiedJeromeyoung/CVE-2021-26086ColdFusionX/CVE-2021-26086Official-BlackHat13/CVE-2021-26086
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2024-11-12
Patch Due Date
2024-12-03
Ransomware Use
Unknown
Required Action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Published
2021-08-16
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-vvhj-8w7x-qj58

Frequently asked questions

What is CVE-2021-26086?

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.

Is CVE-2021-26086 actively exploited?

Yes. CVE-2021-26086 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2024-12-03.

What is the CVSS score for CVE-2021-26086?

CVE-2021-26086 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

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