# CVE-2026-72759: cti-transmute Conversion History Authorization Bypass Leads to Sensitive Data Disclosure After Conversion Deletion

> Attackers can view sensitive data from deleted conversions due to an incomplete authorization check in the MISP cti-transmute history endpoint.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Aug 2026
- **Updated:** 10 Aug 2026
- **Also known as:** GHSA-9p5q-96wv-4xvh

## What is CVE-2026-72759?

CVE-2026-72759 is a medium-severity missing authorization vulnerability in misp cti-transmute, published on 10 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In affected versions of MISP cti-transmute, the conversion-history details endpoint performs an incomplete authorization check. When a history record references a deleted conversion, the associated conversion lookup returns None. The previous logic only denied access when the conversion object existed and the visibility check failed. As a result, deleted conversions bypassed the authorization check and their retained history input/output could be disclosed to a user able to request the corresponding history entry. The July 22, 2026 commit changes the logic to deny access whenever the conversion is missing or the requester lacks permission

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-72759?


## How do I fix CVE-2026-72759?

No fix has been published for CVE-2026-72759 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-72759 being exploited?

There is no known exploitation of CVE-2026-72759 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-72759 and fix it if it is affected.

What it is: CVE-2026-72759 is a medium-severity missing authorization vulnerability in misp cti-transmute, published on 10 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-72759 in the wild and no public exploit code.

Affected product: misp cti-transmute. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-72759/ (Markdown: https://insights.sbomify.com/CVE-2026-72759/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-72759
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-72759
- OSV: https://osv.dev/vulnerability/CVE-2026-72759

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-72759/
Summaries are generated and may contain mistakes; the official description above is the record.