TI-2026-20628 Aliases CVE-2026-25519

OpenSlides has incorrect access control vulnerability in authentication service

MEDIUM 44CWE-284Published 2026-02-04 · Updated 2026-02-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-284.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00546 45th percentileScored 2026-11-07

Fix Fixed OpenSlides (OpenSlides): 4.2.29

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Intevation	OpenSlides	before 4.2.29	4.2.29	Patch available	CNA

OpenSlides VendorIntevation Affected before 4.2.29 Fixed in 4.2.29 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:openslides:openslides::::::::	4.2.5 to before 4.2.29	Vulnerable	Intevation

cpe:2.3:a:openslides:openslides:*:*:*:*:*:*:*:* Versions 4.2.5 to before 4.2.29 Vulnerable ·Intevation

Remediation

Fix · CNA OpenSlides (OpenSlides) Fixed in 4.2.29

Timeline

2026-10-02 Threatist record created from CVE-2026-25519
2026-10-25 EPSS moved to the below the 50th percentile

References

Patch 2

Other 2

TI-2025-21650 Observable discrepancy in Intevation OpenSlides CVSS 3.1MEDIUM 5.3
TI-2025-21649 Path traversal in Intevation OpenSlides CVSS 3.1MEDIUM 6.5
TI-2025-21648 Cross-site scripting in Intevation OpenSlides CVSS 3.1MEDIUM 6.1
TI-2025-21651 Improper output encoding in Intevation OpenSlides CVSS 3.1MEDIUM 4.1
TI-2020-16101 XSS in OpenSlides CVSS 3.1HIGH 8.9
TI-2024-15167 OpenSlides 4.0.15 verifies passwords by comparing password hashes using a function with… CVSS 3.1HIGH 7.5

See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences