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Critical

Authenticated arbitrary code execution in Sonatype Nexus Repository task management

IdentifiersCVE-2026-3199CWE-502· Deserialization of Untrusted Data

CVE-2026-3199 is an authenticated arbitrary code execution vulnerability in the task management component of Sonatype Nexus Repository. It affects Nexus Repository versions 3.22.1 through 3.90.2. According to the provided content, an attacker with permissions to create tasks can execute arbitrary code by bypassing the nexus.scripts.allowCreation security control. This indicates a failure in enforcement of script-related security restrictions within task handling or task creation logic, allowing code execution despite the intended control.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows arbitrary code execution in the context of the affected Sonatype Nexus Repository instance by an authenticated user with task creation permissions. The provided CVSS v4.0 vector indicates high impact to confidentiality, integrity, and availability, consistent with full compromise of the application and potentially the underlying host or connected repository data depending on deployment context.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, restrict or remove task creation permissions from non-administrative users and tightly limit access to authenticated accounts capable of creating tasks. Monitor for suspicious task creation or execution activity and review configurations related to script and task management controls, including reliance on nexus.scripts.allowCreation, since the vulnerability bypasses that control. These are interim measures only; patching is the primary remediation.

Remediation

Patch, then assume compromise.

Upgrade Sonatype Nexus Repository to version 3.91.0 or later, as the provided content references Sonatype Nexus Repository 3.91.0 release notes in connection with this CVE. Review Sonatype's support advisory associated with identifier 50615414548499 for vendor-specific remediation guidance. Verify that all affected instances running versions 3.22.1 through 3.90.2 are updated.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
SonatypeNexus Repository Managerapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

5 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

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Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity4

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-3199
NVD
nvd.nist.gov/vuln/detail/CVE-2026-3199
MITRE CWE · CWE-502
Deserialization of Untrusted Data
help.sonatype.com
help.sonatype.com/en/sonatype-nexus-repository-3-91-0-release-notes.html
support.sonatype.com
support.sonatype.com/hc/en-us/articles/50615414548499