# CVE-2026-97864: GibbonEdu Gibbon Unit Planner units_add_blockAjax.php makeBlock missing authentication

> Remote attackers can modify unit planner blocks without authentication due to missing checks in the makeBlock function.

- **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/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Sep 2026
- **Updated:** 25 Sep 2026
- **Also known as:** GHSA-whgc-w9f2-pcrv

## What is CVE-2026-97864?

CVE-2026-97864 is a medium-severity missing authorization vulnerability in GibbonEdu Gibbon, published on 25 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been found in GibbonEdu Gibbon up to 30.0.01. The affected element is the function makeBlock of the file modules/Planner/units_add_blockAjax.php of the component Unit Planner. The manipulation of the argument gibbonUnitBlockID/mode leads to missing authentication. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 31.0.00 is sufficient to fix this issue. The identifier of the patch is 07e719368eae8dfb4e22e19424ceab6074164ebc. It is recommended to upgrade the affected component.

Weakness: CWE-306 (Missing Authentication for Critical Functionality), CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-97864?


## How do I fix CVE-2026-97864?

No fix has been published for CVE-2026-97864 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-97864 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-97864 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-97864 and fix it if it is affected.

What it is: CVE-2026-97864 is a medium-severity missing authorization vulnerability in GibbonEdu Gibbon, published on 25 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-97864 exists.

Affected product: GibbonEdu Gibbon. 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-2026-97864/ (Markdown: https://insights.sbomify.com/CVE-2026-97864/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-97864
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-97864
- OSV: https://osv.dev/vulnerability/CVE-2026-97864

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-97864/
Summaries are generated and may contain mistakes; the official description above is the record.