Vulnerability in Openslides
CVE-2026-25519
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (50.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.002
Affected products
- Openslides — versions < 4.2.29
Weakness classification (CWE)
References
- github.com/OpenSlides/OpenSlides/security/advisories/GHSA-vv4h-8wfc-pf8c (Patch, Vendor Advisory)
- github.com/OpenSlides/openslides-auth-service/pull/889 (Issue Tracking)
- github.com/OpenSlides/openslides-auth-service/commit/70c1aa9f5e1db59ec120ecce98… (Patch)
- github.com/OpenSlides/OpenSlides/releases/tag/4.2.29 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-25519?
- CVE-2026-25519 is a high-severity vulnerability in Openslides, classified under Improper Access Control. CVSS score: 8.1/10. Published 2026-02-04.
- How severe is CVE-2026-25519?
- High severity. CVSS v3 base score is 8.1 out of 10.