# CVE-2026-21626: Extension - stackideas.com - Information disclosure in post custom fields in EasyDiscuss 1.0.0-5.0.15 for Joomla

> Attackers can access restricted forum post custom fields via JSON output due to missing access control checks in the EasyDiscuss extension.

- **Severity:** Critical 9.2 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/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:** 6 Feb 2026
- **Updated:** 20 Feb 2026
- **Also known as:** GHSA-xfjv-gcf8-3jqc

## What is CVE-2026-21626?

CVE-2026-21626 is a critical vulnerability in Stackideas.com EasyDiscuss extension for Joomla, published on 6 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Access control settings for forum post custom fields are not applied to the JSON output type, leading to an ACL violation vector an information disclosure

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2026-21626?

It affects 1 product.


Products: Stackideas Easydiscuss.

## How do I fix CVE-2026-21626?

No fix has been published for CVE-2026-21626 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-21626 being exploited?

There is no known exploitation of CVE-2026-21626 in the wild and no public exploit code.

## Other vulnerabilities in Stackideas.com EasyDiscuss extension for Joomla

- [CVE-2026-21623](https://insights.sbomify.com/CVE-2026-21623/): Extension - stackideas.com - Persistent XSS in EasyDiscuss component 1.0.0-5.0.15 for Joomla (critical 9.4)
- [CVE-2026-21624](https://insights.sbomify.com/CVE-2026-21624/): Extension - stackideas.com - Persistent XSS in EasyDiscuss component 1.0.0-5.0.15 for Joomla (critical 9.4)
- [CVE-2023-51810](https://insights.sbomify.com/CVE-2023-51810/): SQL injection in n/a (high 7.5)
- [CVE-2018-5263](https://insights.sbomify.com/CVE-2018-5263/): Cross-site scripting in n/a (medium 5.4)
- [CVE-2026-21625](https://insights.sbomify.com/CVE-2026-21625/): Extension - stackideas.com - Lack of mime type validation in EasyDiscuss component 1.0.0-5.0.15 for Joomla (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-21626 and fix it if it is affected.

What it is: CVE-2026-21626 is a critical vulnerability in Stackideas.com EasyDiscuss extension for Joomla, published on 6 Feb 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-2026-21626 in the wild and no public exploit code.

Affected product: Stackideas.com EasyDiscuss extension for Joomla. 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-2026-21626/ (Markdown: https://insights.sbomify.com/CVE-2026-21626/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-21626
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-21626
- OSV: https://osv.dev/vulnerability/CVE-2026-21626

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-21626/
Summaries are generated and may contain mistakes; the official description above is the record.