CVE-2026-72548 OpenSignLabs CVE debrief

Who should care

Security teams and administrators responsible for OpenSignLabs OpenSign deployments should be aware of this vulnerability and take immediate action to mitigate the risk. They should review and restrict access to the gettenant Parse cloud function, implement proper authentication and authorization checks, and monitor for potential exploitation attempts. Additionally, operators and platform administrators should review the vulnerability details and assess the potential impact on their systems. Vulnerability management and security teams should prioritize this vulnerability due to its high CVSS score of 7.5 and potential for significant data exposure. They should also verify the version of OpenSignLabs OpenSign is up to date and review compensating controls for exposed systems while remediation is scheduled and verified. Asset inventory and security teams should track exceptions, retest remediated assets, and close the item only after evidence is documented. This requires coordination with affected teams and stakeholders to ensure comprehensive mitigation and remediation efforts are undertaken promptly and effectively, considering the potential operational impact and source-confidence limits of the vulnerability in OpenSign through version 2.37.0. Security teams should also consider the likely operational impact of this vulnerability on their systems and prioritize mitigation efforts accordingly, taking into account the vulnerability class and affected product context provided in the CVE record and NVD entry. This vulnerability affects OpenSignLabs OpenSign deployments, and its exploitation could lead to unauthorized disclosure of tenant configuration data for any organization in the system. Therefore, it is crucial for security teams and administrators to assess their exposure and implement necessary controls to prevent exploitation. This includes reviewing the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance, and planning vendor-supported updates or mitigations through normal change control where exposure is confirmed. Compensating controls should be reviewed for exposed systems while remediation is scheduled and

Technical summary

The vulnerability exists in the gettenant Parse cloud function of OpenSignLabs OpenSign through version 2.37.0. This function allows unauthenticated remote attackers to retrieve any organization tenant record by providing a contactId parameter. The function returns the full tenant record without any authentication or authorization checks. This enables attackers to enumerate and disclose tenant configuration data for any organization in the system.

Defensive priority

High priority due to the high CVSS score of 7.5 and the potential for significant data exposure.

Recommended defensive actions

• Verify the version of OpenSignLabs OpenSign is up to date
• Review and restrict access to the gettenant Parse cloud function
• Implement proper authentication and authorization checks
• Monitor for potential exploitation attempts
• Review tenant configuration data for any signs of exposure

Evidence notes

The CVE record and NVD entry provide details about the vulnerability. Further verification is recommended. To verify, security teams should review the official CVE Program record and NIST NVD detail page. They should also check for any additional information from OpenSignLabs regarding the vulnerability in OpenSign through version 2.37.0. Defensive verification tasks include reviewing tenant configuration data for any signs of exposure and monitoring for potential exploitation attempts.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.