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CVE-2021-26086 is a path traversal vulnerability in Atlassian Jira Server and Jira Data Center that affects the /WEB-INF/web.xml endpoint. A remote attacker can exploit improper path restriction handling to read arbitrary or attacker-selected files that should not be exposed through the web application. Affected releases include versions before 8.5.14, versions from 8.6.0 before 8.13.6, and versions from 8.14.0 before 8.16.1.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Confluence vulnerability listed among issues suspected to be exploited by Iran-linked actors; the content notes Confluence issues remain widely exploitable and useful as scalable entry points.
A specific known vulnerability identified as CVE-2021-26086 affecting a NEKOBYTE JIRA instance, mentioned only as part of the researchers' data collection methodology.
A path traversal vulnerability in Atlassian JIRA (CVE-2021-26086) allows remote attackers to read files via the /WEB-INF/web.xml endpoint.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.