CVE-2026-15389Network attack vector

Confidential data disclosure via unbound USID validation

Published Jul 14, 2026 · Updated Jul 14, 2026

Authorization bypass in Sesame HR's Sesame Time web application and REST v3 API allows remote attackers to read confidential user data. The REST v3 security profile and private notification endpoints accept a USID as the sole authorization key without checking session ownership. Exploitation requires a valid victim USID; unrevoked USIDs from earlier logins remain usable, exposing email addresses, identifiers, roles, and corporate data without reported integrity or availability impact.

CVSS severity8.7
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Sesame HR's Sesame Time web application and REST v3 API allows remote attackers to read confidential user data. The REST v3 security profile and private notification endpoints accept a USID as the sole authorization key without checking session ownership. Exploitation requires a valid victim USID; unrevoked USIDs from earlier logins remain usable, exposing email addresses, identifiers, roles, and corporate data without reported integrity or availability impact.

The record

CVE
CVE-2026-15389
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Sesame HR
Product
Sesame HR
Classifications
CWE-639, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 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=0 <*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sesame HR · Sesame HRversion=0 <*

Published CVSS scores

8.7INCIBECVSS:4.0/AV:N/AC:L/AT:N/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1550.004Use Alternate Authentication Material: Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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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