vulnerability / NVI-00004420 / Revision 3
EGroupware has a Remote Code Execution Vulnerability
GitHub lists this reviewed advisory for egroupware/egroupware, egroupware/egroupware. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
0.975%
FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.62097. Missing scores are unknown.
As of · FIRST EPSS
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
egroupware/egroupware
source listed>= 26.0.20251208, < 26.2.20260224
## Summary A critical vulnerability has been identified in EGroupware that may lead to Remote Code Execution (RCE). The issue allows an authenticated attacker to execute arbitrary commands on the server. If user self-registration is enabled, the vulnerability may be exploitable without prior authentication. The vulnerability stems from improper authorization checks combined with a file write primitive and an arbitrary file read vulnerability, which together enable full system compromise. ## Details ### 1. Improper Authorization in SmallPartMediaRecorder::ajax_upload() The vulnerability originates in: `EGroupware\SmallParT\Widgets\SmallPartMediaRecorder::ajax_upload()` The function attempts to verify whether the current user is a teacher of the specified course ID before allowing a file upload. The critical authorization check ensures that the course access control list (ACL) contains: `$required_acl (self::ROLE_TEACHER, i.e., 3)` However, the `course_acl `value is derived from user-controlled request data. **_Bypass Technique_** A crafted request can manipulate the `participant_role `value inside the request body: ```json { "video": { "course_id": { "particip
egroupware/egroupware
source listed< 23.1.20260224
## Summary A critical vulnerability has been identified in EGroupware that may lead to Remote Code Execution (RCE). The issue allows an authenticated attacker to execute arbitrary commands on the server. If user self-registration is enabled, the vulnerability may be exploitable without prior authentication. The vulnerability stems from improper authorization checks combined with a file write primitive and an arbitrary file read vulnerability, which together enable full system compromise. ## Details ### 1. Improper Authorization in SmallPartMediaRecorder::ajax_upload() The vulnerability originates in: `EGroupware\SmallParT\Widgets\SmallPartMediaRecorder::ajax_upload()` The function attempts to verify whether the current user is a teacher of the specified course ID before allowing a file upload. The critical authorization check ensures that the course access control list (ACL) contains: `$required_acl (self::ROLE_TEACHER, i.e., 3)` However, the `course_acl `value is derived from user-controlled request data. **_Bypass Technique_** A crafted request can manipulate the `participant_role `value inside the request body: ```json { "video": { "course_id": { "particip
egroupware/egroupware
source listedECOSYSTEM: introduced 26.0.20251208; fixed 26.2.20260224
## Summary A critical vulnerability has been identified in EGroupware that may lead to Remote Code Execution (RCE). The issue allows an authenticated attacker to execute arbitrary commands on the server. If user self-registration is enabled, the vulnerability may be exploitable without prior authentication. The vulnerability stems from improper authorization checks combined with a file write primitive and an arbitrary file read vulnerability, which together enable full system compromise. ## Details ### 1. Improper Authorization in SmallPartMediaRecorder::ajax_upload() The vulnerability originates in: `EGroupware\SmallParT\Widgets\SmallPartMediaRecorder::ajax_upload()` The function attempts to verify whether the current user is a teacher of the specified course ID before allowing a file upload. The critical authorization check ensures that the course access control list (ACL) contains: `$required_acl (self::ROLE_TEACHER, i.e., 3)` However, the `course_acl `value is derived from user-controlled request data. **_Bypass Technique_** A crafted request can manipulate the `participant_role `value inside the request body: ```json { "video": { "course_id": { "particip
egroupware/egroupware
source listedECOSYSTEM: introduced 0; fixed 23.1.20260224
## Summary A critical vulnerability has been identified in EGroupware that may lead to Remote Code Execution (RCE). The issue allows an authenticated attacker to execute arbitrary commands on the server. If user self-registration is enabled, the vulnerability may be exploitable without prior authentication. The vulnerability stems from improper authorization checks combined with a file write primitive and an arbitrary file read vulnerability, which together enable full system compromise. ## Details ### 1. Improper Authorization in SmallPartMediaRecorder::ajax_upload() The vulnerability originates in: `EGroupware\SmallParT\Widgets\SmallPartMediaRecorder::ajax_upload()` The function attempts to verify whether the current user is a teacher of the specified course ID before allowing a file upload. The critical authorization check ensures that the course access control list (ACL) contains: `$required_acl (self::ROLE_TEACHER, i.e., 3)` However, the `course_acl `value is derived from user-controlled request data. **_Bypass Technique_** A crafted request can manipulate the `participant_role `value inside the request body: ```json { "video": { "course_id": { "particip
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. FIRST EPSS
- vendor patch
The original advisory lists fixed boundaries 26.2.20260224 for egroupware/egroupware. Confirm the publisher’s latest guidance.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database via OSV
- vendor patch
The original advisory lists fixed boundaries 23.1.20260224 for egroupware/egroupware. Confirm the publisher’s latest guidance.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database via OSV
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.
- GHSA-h9qx-v5xp-ph8p ↗
GitHub Advisory Database · vendor advisory
Observed . GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.
- GHSA-h9qx-v5xp-ph8p ↗
GitHub Advisory Database via OSV · vendor advisory
Observed . GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.
- CVE-2026-27823 ↗
FIRST EPSS · official catalog
Observed . FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.
Public revision history
Only published revisions appear here. Routine fetches do not create a material-change event.
- Revision 3 ·
Source facts changed; compare the preserved prior revision.
- Revision 2 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.