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CVE-2026-72544 – Audit-Trail Forgery / Data Authenticity Bypass – OpenSign through 2.37.0

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Summary

CVE-2026-72544 is an insufficient verification of data authenticity vulnerability (CWE-345) in OpenSignLabs OpenSign, an open-source document e-signature platform. An unauthenticated, network-based attacker can fabricate document audit-trail entries, undermining the integrity and non-repudiation of signed documents. It is rated HIGH severity with a CVSS v3.1 base score of 7.5.

Technical details

  • Root cause: The triggerevent Parse cloud function accepts viewer identity and IP address as user-supplied parameters without verifying their authenticity.
  • Trigger conditions: An attacker submits crafted parameters to the function; no authentication or user interaction is required.
  • Attack vector: Network (remotely reachable over the application’s exposed interface).
  • Impact: Attackers can tamper with and forge signed-document audit logs, compromising the integrity and legal standing of audit records. Confidentiality and availability are not affected.

Affected software

  • OpenSignLabs OpenSign: all versions from 0 through 2.37.0.

Severity

  • CVSS v3.1 base score: 7.5 (HIGH)
  • Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Mitigation and recommended actions

  • Immediate: No fixed version is specified in the CVE record at time of writing. Monitor the OpenSign project repository for a release addressing this issue and upgrade as soon as one is published.
  • If no patch: Restrict network exposure of the OpenSign application, place it behind authenticated access controls and a reverse proxy or WAF, and treat existing audit-trail data with caution until a fix is applied.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Raw HTTP response body: opensign-server is running!!!
  • description meta tag content: The fastest way to sign PDFs & request signatures from others

References

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How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

Are you exposed?

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  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
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