CVE-2020-10199Known exploitationPublic exploitNetwork attack vector

Authenticated code execution via unescaped validation template

Published Apr 1, 2020 · Updated Oct 21, 2025

Java EL injection in Sonatype Nexus Repository 3.x through 3.21.1 allows remote authenticated users to execute code on the server. ConstraintViolationFactory passes attacker-controlled repository names to buildConstraintViolationWithTemplate without applying stripJavaEL, causing EL evaluation. Any account can reach the sink while creating or updating a Go group repository because bean validation precedes authorization, and injected code runs with Nexus process privileges.

CVSS severity9.1
Critical
EPSS probability99.06%
Next 30 days · Nov 1, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Java EL injection in Sonatype Nexus Repository 3.x through 3.21.1 allows remote authenticated users to execute code on the server. ConstraintViolationFactory passes attacker-controlled repository names to buildConstraintViolationWithTemplate without applying stripJavaEL, causing EL evaluation. Any account can reach the sink while creating or updating a Go group repository because bean validation precedes authorization, and injected code runs with Nexus process privileges.

The record

CVE
CVE-2020-10199
Published
Apr 1, 2020
Updated
Oct 21, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-917, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 1, 2020CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.1SonatypeCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsShadowserver observations through Sep 28, 2026. Gaps indicate unavailable data.
Sep 22, 2026Sep 28, 2026
View daily counts
Reporting dayUnique IPs
Sep 22, 2026Unavailable
Sep 23, 2026Unavailable
Sep 24, 2026Unavailable
Sep 25, 2026Unavailable
Sep 26, 20261
Sep 27, 2026Unavailable
Sep 28, 2026Unavailable
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-917Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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