CVE-2026-77123Network attack vectorHinoki check available

Webhook secret disclosure via capability read API

Published Sep 2, 2026 · Updated Sep 2, 2026

Information disclosure in Sonatype Nexus Repository 3.2.0 through 3.95.x allows remote authenticated users to read webhook shared secrets. The capability read API serializes a webhook capability's plaintext shared-secret property into its response instead of replacing the value with the required mask. Exploitation requires nexus:capabilities:read privilege and an existing webhook secret, exposing that secret without reported integrity or availability impact.

CVSS severity6.0
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Information disclosure in Sonatype Nexus Repository 3.2.0 through 3.95.x allows remote authenticated users to read webhook shared secrets. The capability read API serializes a webhook capability's plaintext shared-secret property into its response instead of replacing the value with the required mask. Exploitation requires nexus:capabilities:read privilege and an existing webhook secret, exposing that secret without reported integrity or availability impact.

The record

CVE
CVE-2026-77123
Published
Sep 2, 2026
Updated
Sep 2, 2026
Vendor
Sonatype
Product
Nexus Repository
Classifications
CWE-201, T1552
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 2, 2026Record 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=3.2.0 <3.96.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Sonatype · Nexus Repositoryversion=3.2.0 <3.96.0

Published CVSS scores

6.0SonatypeCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-201Insertion of Sensitive Information Into Sent Data
T1552Unsecured Credentials

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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