by Kastro
Paper/Archive/CVE-2026-25519

CVE-2026-25519

OpenSlides OpenSlides — OpenSlides has incorrect access control vulnerability in authentication service

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
39
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 45.8.458 × 209.2No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
OpenSlides< 4.2.29–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub_M (CNA)8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/OpenSlides/OpenSlides/security/advisories/GHSA-vv4h-8wfc-pf8crefgithub.com/OpenSlides/openslides-auth-service/pull/889refgithub.com/OpenSlides/openslides-auth-service/commit/70c1aa9f5e1db59ec120ecce98d1c1169350a4eerefgithub.com/OpenSlides/OpenSlides/releases/tag/4.2.29