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Jira Data CenterApplication · Atlassian

CVE-2021-39126

MEDIUM · 6.5 CVSS v3.1 Published 2021-10-21
Fix available
A fix is available. Upgrade to 8.5.10 / 8.13.1 or later.
See remediation →
72/100
Remediation priority · Elevated
Remotely reachable No privileges Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Affected versions of Atlassian Jira Server and Data Center allow remote attackers to modify various resources via a Cross-Site Request Forgery (CSRF) vulnerability, following an Information Disclosure vulnerability in the referrer headers which discloses a user's CSRF token. The affected versions are before version 8.5.10, and from version 8.6.0 before 8.13.1.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-352

The application can't tell whether a state-changing request was genuinely intended by the user, so an attacker can trick a logged-in victim's browser into making it. That can transfer funds, change settings, or create accounts silently. Remediation is anti-CSRF tokens — or equivalent same-site protections — on every state-changing request.

General guidance for the cross-site request forgery (csrf) class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Jira Data CenterApplication
Affected:< 8.5.10>= 8.6.0, < 8.13.1
Jira ServerApplication
Affected:< 8.5.10>= 8.6.0, < 8.13.1

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 8.5.10 / 8.13.1 or later
Fixed in 8.5.108.13.1
Vendor patch jira.atlassian.com →
Recommended fix High confidence

Upgrade to Jira 8.5.10, 8.13.1, or later stable releases

  1. Back up your Jira database before starting any upgrade
  2. Check your current Jira version in the administration console
  3. Review Atlassian's upgrade documentation for your migration path (https://confluence.atlassian.com/jira/upgrade-166933461.html)
  4. Download the target fixed version (8.5.10 or 8.13.1 or later) from Atlassian's official download page
  5. Stop your Jira instance
  6. Follow Atlassian's standard upgrade procedure for your deployment type (Data Center or Server)
  7. Start the upgraded Jira instance
  8. Verify the upgrade was successful and the version matches the fixed release
Caveat Review Atlassian's upgrade notes for breaking changes between your current version and target version; major version upgrades may require migration steps

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,600. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-39126 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
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