vulnerability / NVI-00006527 / Revision 2
Poweradmin: OIDC `sub` collation bypass in Poweradmin leading to account takeover
GitHub lists this reviewed advisory for poweradmin/poweradmin, poweradmin/poweradmin. 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.
8.1 high
GitHub source severity; exploitability and local consequence require separate evidence.
As of · GitHub Advisory Database
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
poweradmin/poweradmin
source listed>= 4.1.0, < 4.2.5
## Preface Poweradmin maps OIDC identities into local users through `oidc_user_links.oidc_subject` plus `provider_id`. In the MySQL schema, the OIDC link table explicitly uses `utf8mb4_unicode_ci`, which is case-insensitive and accent-insensitive. OIDC `sub` is a stable external subject identifier and should be matched byte-for-byte within the issuer/provider scope. The confirmed local PoC used two different OIDC users: - Victim subject: `victim-login` - Attacker subject: `victím-login` (`í`, U+00ED) MySQL reported those two subjects as equal under `utf8mb4_unicode_ci`. After the victim linked their OIDC account, the attacker authenticated to the same provider with the attacker's own password and Poweradmin resolved the session to the victim's local account. ## Server Info - **Application:** Poweradmin - **Version:** `targets/poweradmin` git `e1f9c9a` - **Database:** MySQL `8.4.10`, `character_set_server=utf8mb4`, `collation_server=utf8mb4_unicode_ci` - **Access Permissions:** Any user who can create or control an account in the connected OIDC provider - **Auth Method:** OIDC generic provider - **Tools:** Docker Compose, local OIDC provider, Python PoC harness **Affected Ent
poweradmin/poweradmin
source listed>= 4.3.0, < 4.3.4
## Preface Poweradmin maps OIDC identities into local users through `oidc_user_links.oidc_subject` plus `provider_id`. In the MySQL schema, the OIDC link table explicitly uses `utf8mb4_unicode_ci`, which is case-insensitive and accent-insensitive. OIDC `sub` is a stable external subject identifier and should be matched byte-for-byte within the issuer/provider scope. The confirmed local PoC used two different OIDC users: - Victim subject: `victim-login` - Attacker subject: `victím-login` (`í`, U+00ED) MySQL reported those two subjects as equal under `utf8mb4_unicode_ci`. After the victim linked their OIDC account, the attacker authenticated to the same provider with the attacker's own password and Poweradmin resolved the session to the victim's local account. ## Server Info - **Application:** Poweradmin - **Version:** `targets/poweradmin` git `e1f9c9a` - **Database:** MySQL `8.4.10`, `character_set_server=utf8mb4`, `collation_server=utf8mb4_unicode_ci` - **Access Permissions:** Any user who can create or control an account in the connected OIDC provider - **Auth Method:** OIDC generic provider - **Tools:** Docker Compose, local OIDC provider, Python PoC harness **Affected Ent
poweradmin/poweradmin
source listedECOSYSTEM: introduced 4.1.0; fixed 4.2.5
## Preface Poweradmin maps OIDC identities into local users through `oidc_user_links.oidc_subject` plus `provider_id`. In the MySQL schema, the OIDC link table explicitly uses `utf8mb4_unicode_ci`, which is case-insensitive and accent-insensitive. OIDC `sub` is a stable external subject identifier and should be matched byte-for-byte within the issuer/provider scope. The confirmed local PoC used two different OIDC users: - Victim subject: `victim-login` - Attacker subject: `victím-login` (`í`, U+00ED) MySQL reported those two subjects as equal under `utf8mb4_unicode_ci`. After the victim linked their OIDC account, the attacker authenticated to the same provider with the attacker's own password and Poweradmin resolved the session to the victim's local account. ## Server Info - **Application:** Poweradmin - **Version:** `targets/poweradmin` git `e1f9c9a` - **Database:** MySQL `8.4.10`, `character_set_server=utf8mb4`, `collation_server=utf8mb4_unicode_ci` - **Access Permissions:** Any user who can create or control an account in the connected OIDC provider - **Auth Method:** OIDC generic provider - **Tools:** Docker Compose, local OIDC provider, Python PoC harness **Affected Ent
poweradmin/poweradmin
source listedECOSYSTEM: introduced 4.3.0; fixed 4.3.4
## Preface Poweradmin maps OIDC identities into local users through `oidc_user_links.oidc_subject` plus `provider_id`. In the MySQL schema, the OIDC link table explicitly uses `utf8mb4_unicode_ci`, which is case-insensitive and accent-insensitive. OIDC `sub` is a stable external subject identifier and should be matched byte-for-byte within the issuer/provider scope. The confirmed local PoC used two different OIDC users: - Victim subject: `victim-login` - Attacker subject: `victím-login` (`í`, U+00ED) MySQL reported those two subjects as equal under `utf8mb4_unicode_ci`. After the victim linked their OIDC account, the attacker authenticated to the same provider with the attacker's own password and Poweradmin resolved the session to the victim's local account. ## Server Info - **Application:** Poweradmin - **Version:** `targets/poweradmin` git `e1f9c9a` - **Database:** MySQL `8.4.10`, `character_set_server=utf8mb4`, `collation_server=utf8mb4_unicode_ci` - **Access Permissions:** Any user who can create or control an account in the connected OIDC provider - **Auth Method:** OIDC generic provider - **Tools:** Docker Compose, local OIDC provider, Python PoC harness **Affected Ent
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. GitHub Advisory Database
- vendor patch
The original advisory lists fixed boundaries 4.2.5 for poweradmin/poweradmin. 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 4.3.4 for poweradmin/poweradmin. 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-cmwh-g2h8-c222 ↗
GitHub Advisory Database · vendor advisory
Observed . GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.
- GHSA-cmwh-g2h8-c222 ↗
GitHub Advisory Database via OSV · vendor advisory
Observed . GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.
Public revision history
Only published revisions appear here. Routine fetches do not create a material-change event.
- Revision 2 ·
Source facts changed; compare the preserved prior revision.
- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.