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

Quick assessment

Affected
OpenSlides OpenSlides
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenSlides是OpenSlides开源的一个免费的、基于网络的演示和集会系统。用于管理和投影集会的议程、动议和选举。 OpenSlides 4.2.29之前版本存在访问控制错误漏洞，该漏洞源于外部IDP同步用户的本地登录存在访问控制不当，可能导致使用简单密码成功登录。

CVSS 8.1 · High EPSS 0.74% · P53
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I. Basic Information for CVE-2026-25519

Vulnerability Information
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Vulnerability Title
OpenSlides has incorrect access control vulnerability in authentication service
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
OpenSlides 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenSlides是OpenSlides开源的一个免费的、基于网络的演示和集会系统。用于管理和投影集会的议程、动议和选举。 OpenSlides 4.2.29之前版本存在访问控制错误漏洞，该漏洞源于外部IDP同步用户的本地登录存在访问控制不当，可能导致使用简单密码成功登录。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenSlides OpenSlides < 4.2.29 -

II. Public POCs for CVE-2026-25519

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III. Intelligence Information for CVE-2026-25519

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IV. Related Vulnerabilities

Same product: OpenSlides
Same vendor: OpenSlides
Same weakness: CWE-284

V. Comments for CVE-2026-25519

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