CVE-2026-9221Network attack vector

Session-ID disclosure via reversible MD5 request signatures

Published Jun 25, 2026 · Updated Jun 25, 2026

Cryptographic weakness in SeTracker2 3.1.5 and earlier allows remote attackers to recover session IDs from MD5 request signatures. The Android client uses MD5 to generate REST API request signatures, allowing recovery of the session identifier carried by the signature scheme. No credentials or user interaction are required; recovered identifiers permit account impersonation and authenticated API requests, with no reported integrity or availability impact.

CVSS severity8.7
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cryptographic weakness in SeTracker2 3.1.5 and earlier allows remote attackers to recover session IDs from MD5 request signatures. The Android client uses MD5 to generate REST API request signatures, allowing recovery of the session identifier carried by the signature scheme. No credentials or user interaction are required; recovered identifiers permit account impersonation and authenticated API requests, with no reported integrity or availability impact.

The record

CVE
CVE-2026-9221
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
Shenzhen i365-Tech Co., Ltd.
Product
SeTracker2
Classifications
CWE-327, T1635
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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 <=3.1.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shenzhen i365-Tech Co., Ltd. · SeTracker2version=0 <=3.1.5

Published CVSS scores

7.5ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.7ICS-CERTCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm
T1635Steal Application Access Token

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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