CVE-2026-72545Network attack vectorHinoki check available

Unauthenticated contact overwrite via unchecked record identifier

Published Aug 11, 2026 · Updated Aug 11, 2026

Authorization bypass in OpenSignLabs OpenSign through 2.37.0 allows remote attackers to overwrite contact records without authentication. The updatecontacttour Parse cloud function accepts a caller-supplied contact identifier and updates the matching record without authentication or authorization. Network access to the function is sufficient to corrupt contact data for any user; no credentials or user interaction are required.

CVSS severity7.5
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authorization bypass in OpenSignLabs OpenSign through 2.37.0 allows remote attackers to overwrite contact records without authentication. The updatecontacttour Parse cloud function accepts a caller-supplied contact identifier and updates the matching record without authentication or authorization. Network access to the function is sufficient to corrupt contact data for any user; no credentials or user interaction are required.

The record

CVE
CVE-2026-72545
Published
Aug 11, 2026
Updated
Aug 11, 2026
Vendor
OpenSignLabs
Product
OpenSign
Classifications
CWE-639, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 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 <=2.37.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenSignLabs · OpenSignversion=0 <=2.37.0

Published CVSS scores

7.5TuranSecCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1565.001Stored Data Manipulation

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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