CVE-2023-39951Public exploitNetwork attack vector

Email content disclosure via premature URL capture

Published Aug 8, 2023 · Updated Oct 3, 2024

Information exposure in OpenTelemetry Java Instrumentation before 1.28.0 allows remote authenticated users to read email content from telemetry. The AWS SDK v2 interceptor reads SdkHttpRequest.getUri before QueryParametersToBodyInterceptor moves SES query data into the POST body, storing subject and message values in span URL metadata. The condition requires an instrumented SES v1 SendEmail call and access to the resulting telemetry, with no reported data modification or service interruption.

CVSS severity6.5
Medium
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information exposure in OpenTelemetry Java Instrumentation before 1.28.0 allows remote authenticated users to read email content from telemetry. The AWS SDK v2 interceptor reads SdkHttpRequest.getUri before QueryParametersToBodyInterceptor moves SES query data into the POST body, storing subject and message values in span URL metadata. The condition requires an instrumented SES v1 SendEmail call and access to the resulting telemetry, with no reported data modification or service interruption.

The record

CVE
CVE-2023-39951
Published
Aug 8, 2023
Updated
Oct 3, 2024
Vendor
OpenTelemetry
Product
OpenTelemetry Java Instrumentation
Classifications
CWE-200
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.28.0
  2. Affected versionversion=< 1.28.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenTelemetry · OpenTelemetry Java Instrumentationversion=0 <1.28.0; version=< 1.28.0

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor

Public exploit references

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

Technologies

Your stack

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Your stack

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