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16 vulnerabilities by OpenSlides
CVE-2026-25519 (GCVE-0-2026-25519)
Vulnerability from nvd – Published: 2026-02-04 20:50 – Updated: 2026-02-04 21:09
VLAI
Title
OpenSlides has incorrect access control vulnerability in authentication service
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.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-284 - Improper Access Control
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/OpenSlides/OpenSlides/security… | x_refsource_CONFIRM |
| https://github.com/OpenSlides/openslides-auth-ser… | x_refsource_MISC |
| https://github.com/OpenSlides/openslides-auth-ser… | x_refsource_MISC |
| https://github.com/OpenSlides/OpenSlides/releases… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| OpenSlides | OpenSlides |
Affected:
< 4.2.29
|
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CVE-2025-30342 (GCVE-0-2025-30342)
Vulnerability from nvd – Published: 2025-03-21 00:00 – Updated: 2025-03-21 15:03
VLAI
Summary
An XSS issue was discovered in OpenSlides before 4.2.5. When submitting descriptions such as Moderator Notes or Agenda Topics, an editor is shown that allows one to format the submitted text. This allows insertion of various HTML elements. When trying to insert a SCRIPT element, it is properly encoded when reflected; however, adding attributes to links is possible, which allows the injection of JavaScript via the onmouseover attribute and others. When a user moves the mouse over such a prepared link, JavaScript is executed in that user's session.
Severity
5.4 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Intevation | OpenSlides |
Affected:
0 , < 4.2.5
(custom)
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CVE-2025-30345 (GCVE-0-2025-30345)
Vulnerability from nvd – Published: 2025-03-21 00:00 – Updated: 2025-03-21 15:04
VLAI
Summary
An issue was discovered in OpenSlides before 4.2.5. When creating new chats via the chat_group.create action, the user is able to specify the name of the chat. Some HTML elements such as SCRIPT are filtered, whereas others are not. In most cases, HTML entities are encoded properly, but not when deleting chats or deleting messages in these chats. This potentially allows attackers to interfere with the layout of the rendered website, but it is unlikely that victims would click on deleted chats or deleted messages.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-116 - Improper Encoding or Escaping of Output
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Intevation | OpenSlides |
Affected:
0 , < 4.2.5
(custom)
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CVE-2025-30343 (GCVE-0-2025-30343)
Vulnerability from nvd – Published: 2025-03-21 00:00 – Updated: 2025-03-21 14:01
VLAI
Summary
A directory traversal issue was discovered in OpenSlides before 4.2.5. Files can be uploaded to OpenSlides meetings and organized in folders. The interface allows users to download a ZIP archive that contains all files in a folder and its subfolders. If an attacker specifies the title of a file or folder as a relative or absolute path (e.g., ../../../etc/passwd), the ZIP archive generated for download converts that title into a path. Depending on the extraction tool used by the user, this might overwrite files locally outside of the chosen directory.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-24 - Path Traversal: '../filedir'
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Intevation | OpenSlides |
Affected:
0 , < 4.2.5
(custom)
|
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CVE-2025-30344 (GCVE-0-2025-30344)
Vulnerability from nvd – Published: 2025-03-21 00:00 – Updated: 2025-03-21 15:08
VLAI
Summary
An issue was discovered in OpenSlides before 4.2.5. During login at the /system/auth/login/ endpoint, the system's response times differ depending on whether a user exists in the system. The timing discrepancy stems from the omitted hashing of the password (e.g., more than 100 milliseconds).
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Intevation | OpenSlides |
Affected:
0 , < 4.2.5
(custom)
|
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CVE-2024-22892 (GCVE-0-2024-22892)
Vulnerability from nvd – Published: 2024-09-25 00:00 – Updated: 2025-03-14 15:38
VLAI
Summary
OpenSlides 4.0.15 was discovered to be using a weak hashing algorithm to store passwords.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-326 - Inadequate Encryption Strength
Assigner
References
1 reference
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CVE-2024-22893 (GCVE-0-2024-22893)
Vulnerability from nvd – Published: 2024-09-25 00:00 – Updated: 2024-09-26 13:19
VLAI
Summary
OpenSlides 4.0.15 verifies passwords by comparing password hashes using a function with content-dependent runtime. This can allow attackers to obtain information about the password hash using a timing attack.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-269 - Improper Privilege Management
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| openslides | openslides |
Affected:
4.0.15
cpe:2.3:a:openslides:openslides:*:*:*:*:*:*:*:* |
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CVE-2020-26280 (GCVE-0-2020-26280)
Vulnerability from nvd – Published: 2020-12-18 18:25 – Updated: 2024-08-04 15:56
VLAI
Title
XSS in OpenSlides
Summary
OpenSlides is a free, Web-based presentation and assembly system for managing and projecting agenda, motions, and elections of assemblies. OpenSlides version 3.2, due to unsufficient user input validation and escaping, it is vulnerable to persistant cross-site scripting (XSS). In the web applications users can enter rich text in various places, e.g. for personal notes or in motions. These fields can be used to store arbitrary JavaScript Code that will be executed when other users read the respective text. An attacker could utilize this vulnerability be used to manipulate votes of other users, hijack the moderators session or simply disturb the meeting. The vulnerability was introduced with 6eae497abeab234418dfbd9d299e831eff86ed45 on 16.04.2020, which is first included in the 3.2 release. It has been patched in version 3.3 ( in commit f3809fc8a97ee305d721662a75f788f9e9d21938, merged in master on 20.11.2020).
Severity
8.9 (High)
CWE
- CWE-79 - {"CWE-79":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/OpenSlides/OpenSlides/security… | x_refsource_CONFIRM |
| https://github.com/OpenSlides/OpenSlides/pull/5714 | x_refsource_MISC |
| https://github.com/OpenSlides/OpenSlides/commit/f… | x_refsource_MISC |
| https://github.com/OpenSlides/OpenSlides/blob/mas… | x_refsource_MISC |
| https://www.syss.de/fileadmin/dokumente/Publikati… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| OpenSlides | OpenSlides |
Affected:
= 3.2
|
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CVE-2026-25519 (GCVE-0-2026-25519)
Vulnerability from cvelistv5 – Published: 2026-02-04 20:50 – Updated: 2026-02-04 21:09
VLAI
Title
OpenSlides has incorrect access control vulnerability in authentication service
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.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-284 - Improper Access Control
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/OpenSlides/OpenSlides/security… | x_refsource_CONFIRM |
| https://github.com/OpenSlides/openslides-auth-ser… | x_refsource_MISC |
| https://github.com/OpenSlides/openslides-auth-ser… | x_refsource_MISC |
| https://github.com/OpenSlides/OpenSlides/releases… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| OpenSlides | OpenSlides |
Affected:
< 4.2.29
|
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CVE-2025-30342 (GCVE-0-2025-30342)
Vulnerability from cvelistv5 – Published: 2025-03-21 00:00 – Updated: 2025-03-21 15:03
VLAI
Summary
An XSS issue was discovered in OpenSlides before 4.2.5. When submitting descriptions such as Moderator Notes or Agenda Topics, an editor is shown that allows one to format the submitted text. This allows insertion of various HTML elements. When trying to insert a SCRIPT element, it is properly encoded when reflected; however, adding attributes to links is possible, which allows the injection of JavaScript via the onmouseover attribute and others. When a user moves the mouse over such a prepared link, JavaScript is executed in that user's session.
Severity
5.4 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Intevation | OpenSlides |
Affected:
0 , < 4.2.5
(custom)
|
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CVE-2025-30345 (GCVE-0-2025-30345)
Vulnerability from cvelistv5 – Published: 2025-03-21 00:00 – Updated: 2025-03-21 15:04
VLAI
Summary
An issue was discovered in OpenSlides before 4.2.5. When creating new chats via the chat_group.create action, the user is able to specify the name of the chat. Some HTML elements such as SCRIPT are filtered, whereas others are not. In most cases, HTML entities are encoded properly, but not when deleting chats or deleting messages in these chats. This potentially allows attackers to interfere with the layout of the rendered website, but it is unlikely that victims would click on deleted chats or deleted messages.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-116 - Improper Encoding or Escaping of Output
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Intevation | OpenSlides |
Affected:
0 , < 4.2.5
(custom)
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CVE-2025-30343 (GCVE-0-2025-30343)
Vulnerability from cvelistv5 – Published: 2025-03-21 00:00 – Updated: 2025-03-21 14:01
VLAI
Summary
A directory traversal issue was discovered in OpenSlides before 4.2.5. Files can be uploaded to OpenSlides meetings and organized in folders. The interface allows users to download a ZIP archive that contains all files in a folder and its subfolders. If an attacker specifies the title of a file or folder as a relative or absolute path (e.g., ../../../etc/passwd), the ZIP archive generated for download converts that title into a path. Depending on the extraction tool used by the user, this might overwrite files locally outside of the chosen directory.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-24 - Path Traversal: '../filedir'
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Intevation | OpenSlides |
Affected:
0 , < 4.2.5
(custom)
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CVE-2025-30344 (GCVE-0-2025-30344)
Vulnerability from cvelistv5 – Published: 2025-03-21 00:00 – Updated: 2025-03-21 15:08
VLAI
Summary
An issue was discovered in OpenSlides before 4.2.5. During login at the /system/auth/login/ endpoint, the system's response times differ depending on whether a user exists in the system. The timing discrepancy stems from the omitted hashing of the password (e.g., more than 100 milliseconds).
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Intevation | OpenSlides |
Affected:
0 , < 4.2.5
(custom)
|
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CVE-2024-22892 (GCVE-0-2024-22892)
Vulnerability from cvelistv5 – Published: 2024-09-25 00:00 – Updated: 2025-03-14 15:38
VLAI
Summary
OpenSlides 4.0.15 was discovered to be using a weak hashing algorithm to store passwords.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-326 - Inadequate Encryption Strength
Assigner
References
1 reference
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CVE-2024-22893 (GCVE-0-2024-22893)
Vulnerability from cvelistv5 – Published: 2024-09-25 00:00 – Updated: 2024-09-26 13:19
VLAI
Summary
OpenSlides 4.0.15 verifies passwords by comparing password hashes using a function with content-dependent runtime. This can allow attackers to obtain information about the password hash using a timing attack.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-269 - Improper Privilege Management
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| openslides | openslides |
Affected:
4.0.15
cpe:2.3:a:openslides:openslides:*:*:*:*:*:*:*:* |
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CVE-2020-26280 (GCVE-0-2020-26280)
Vulnerability from cvelistv5 – Published: 2020-12-18 18:25 – Updated: 2024-08-04 15:56
VLAI
Title
XSS in OpenSlides
Summary
OpenSlides is a free, Web-based presentation and assembly system for managing and projecting agenda, motions, and elections of assemblies. OpenSlides version 3.2, due to unsufficient user input validation and escaping, it is vulnerable to persistant cross-site scripting (XSS). In the web applications users can enter rich text in various places, e.g. for personal notes or in motions. These fields can be used to store arbitrary JavaScript Code that will be executed when other users read the respective text. An attacker could utilize this vulnerability be used to manipulate votes of other users, hijack the moderators session or simply disturb the meeting. The vulnerability was introduced with 6eae497abeab234418dfbd9d299e831eff86ed45 on 16.04.2020, which is first included in the 3.2 release. It has been patched in version 3.3 ( in commit f3809fc8a97ee305d721662a75f788f9e9d21938, merged in master on 20.11.2020).
Severity
8.9 (High)
CWE
- CWE-79 - {"CWE-79":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/OpenSlides/OpenSlides/security… | x_refsource_CONFIRM |
| https://github.com/OpenSlides/OpenSlides/pull/5714 | x_refsource_MISC |
| https://github.com/OpenSlides/OpenSlides/commit/f… | x_refsource_MISC |
| https://github.com/OpenSlides/OpenSlides/blob/mas… | x_refsource_MISC |
| https://www.syss.de/fileadmin/dokumente/Publikati… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| OpenSlides | OpenSlides |
Affected:
= 3.2
|
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