# CVE-2026-25519: OpenSlides has incorrect access control vulnerability in authentication service

> Attackers can bypass authentication for SAML-synced users by using a trivial password, allowing unauthorized access to the assembly system.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Feb 2026
- **Updated:** 4 Feb 2026
- **Also known as:** GHSA-vv4h-8wfc-pf8c

## What is CVE-2026-25519?

CVE-2026-25519 is a high-severity authentication bypass vulnerability in OpenSlides, published on 4 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

OpenSlides is a free, web based presentation and assembly system for managing and projecting agenda, motions and elections of an assembly. Prior to version 4.2.29, OpenSlides supports local logins with username and password or an optionally configurable single sign on with SAML via an external IDP. For users synced to OpenSlides via an external IDP, there is an incorrect access control regarding the local login of these users. Users can successfully login using the local login form and the OpenSlides username of a SAML user and a trivial password. This password is valid for all SAML users. This issue has been patched in version 4.2.29.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-25519?

It affects 1 product.


Products: Openslides Openslides.

## How do I fix CVE-2026-25519?

No fix has been published for CVE-2026-25519 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-25519 being exploited?

There is no known exploitation of CVE-2026-25519 in the wild and no public exploit code.

## Other vulnerabilities in OpenSlides

- [CVE-2020-26280](https://insights.sbomify.com/CVE-2020-26280/): XSS in OpenSlides (high 8.9)
- [CVE-2024-22892](https://insights.sbomify.com/CVE-2024-22892/): Weak cryptography in n/a (high 7.5)
- [CVE-2024-22893](https://insights.sbomify.com/CVE-2024-22893/): Information disclosure in n/a (high 7.5)
- [CVE-2025-30342](https://insights.sbomify.com/CVE-2025-30342/): Cross-site scripting in OpenSlides (medium 5.4)
- [CVE-2025-30344](https://insights.sbomify.com/CVE-2025-30344/): Information disclosure in OpenSlides (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-25519 and fix it if it is affected.

What it is: CVE-2026-25519 is a high-severity authentication bypass vulnerability in OpenSlides, published on 4 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-2026-25519 in the wild and no public exploit code.

Affected product: OpenSlides. 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-2026-25519/ (Markdown: https://insights.sbomify.com/CVE-2026-25519/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-25519
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-25519
- OSV: https://osv.dev/vulnerability/CVE-2026-25519

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-25519/
Summaries are generated and may contain mistakes; the official description above is the record.