# CVE-2026-63101: Open Event Server 1.19.1 Unauthenticated Member Roster Export via CSV Export Endpoint

> Unauthenticated attackers can export full member rosters including emails and roles from any group via an unprotected CSV export endpoint.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/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:** 17 Jul 2026
- **Updated:** 17 Jul 2026
- **Also known as:** GHSA-ggm5-8rm7-3jgc

## What is CVE-2026-63101?

CVE-2026-63101 is a high-severity missing authorization vulnerability in fossasia open-event-server, published on 17 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Open Event Server through 1.19.1 contains a missing authentication vulnerability that allows unauthenticated attackers to export the complete member roster of any group, including email addresses, names, join dates, and roles, by submitting requests to the group followers CSV export endpoint which lacks any authentication decorator. Attackers can enumerate sequential group IDs via brute-force, trigger an export via the unauthenticated POST endpoint, then poll the unauthenticated task status endpoint until completion to retrieve a download URL containing the full member CSV.

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

## Which versions are affected by CVE-2026-63101?


## How do I fix CVE-2026-63101?

No fix has been published for CVE-2026-63101 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-63101 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63101 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-63101 and fix it if it is affected.

What it is: CVE-2026-63101 is a high-severity missing authorization vulnerability in fossasia open-event-server, published on 17 Jul 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-2026-63101 exists.

Affected product: fossasia open-event-server. 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-2026-63101/ (Markdown: https://insights.sbomify.com/CVE-2026-63101/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-63101
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-63101
- OSV: https://osv.dev/vulnerability/CVE-2026-63101

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-63101/
Summaries are generated and may contain mistakes; the official description above is the record.