CVE-2026-72545: CWE-639: Authorization Bypass Through User-Controlled Key in OpenSignLabs OpenSign
An insecure direct object reference vulnerability in OpenSignLabs OpenSign through 2.37.0 allows unauthenticated remote attackers to write to any contact record via the updatecontacttour Parse cloud function. The function performs no authentication or authorization before updating the target contact record. An attacker can corrupt or overwrite contact data for any user in the system without credentials.
AI Analysis
Technical Summary
CVE-2026-72545 describes an authorization bypass vulnerability (CWE-639) in OpenSignLabs OpenSign up to version 2.37.0. The vulnerability exists because the updatecontacttour Parse cloud function does not perform any authentication or authorization before updating contact records. As a result, unauthenticated remote attackers can write to any contact record, potentially corrupting or overwriting user data without needing valid credentials.
Potential Impact
The vulnerability allows attackers to modify contact data for any user in the system without authentication, leading to integrity loss of user data. There is no confidentiality or availability impact indicated. This could undermine trust in the system and potentially disrupt user communications or data accuracy.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the updatecontacttour function or implement additional authentication and authorization controls to prevent unauthorized updates.
CVE-2026-72545: CWE-639: Authorization Bypass Through User-Controlled Key in OpenSignLabs OpenSign
Description
An insecure direct object reference vulnerability in OpenSignLabs OpenSign through 2.37.0 allows unauthenticated remote attackers to write to any contact record via the updatecontacttour Parse cloud function. The function performs no authentication or authorization before updating the target contact record. An attacker can corrupt or overwrite contact data for any user in the system without credentials.
CVSS v3.1
Score 7.5high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-72545 describes an authorization bypass vulnerability (CWE-639) in OpenSignLabs OpenSign up to version 2.37.0. The vulnerability exists because the updatecontacttour Parse cloud function does not perform any authentication or authorization before updating contact records. As a result, unauthenticated remote attackers can write to any contact record, potentially corrupting or overwriting user data without needing valid credentials.
Potential Impact
The vulnerability allows attackers to modify contact data for any user in the system without authentication, leading to integrity loss of user data. There is no confidentiality or availability impact indicated. This could undermine trust in the system and potentially disrupt user communications or data accuracy.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the updatecontacttour function or implement additional authentication and authorization controls to prevent unauthorized updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- TuranSec
- Date Reserved
- 2026-08-10T10:32:49.081Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7b0703bf8831d539a0cc2c
Added to database: 08/11/2026, 11:26:59 UTC
Last enriched: 08/11/2026, 11:43:19 UTC
Last updated: 08/11/2026, 18:43:13 UTC
Views: 3
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