eduMFA: Incorrect InnoDB snapshot isolation possibly allows token reusage
Impact
For deployments using MySQL or MariaDB < 11.6.2 (or newer with innodb_snapshot_isolation=off) reusage of token values might be possible due to faulty transaction isolation inside the database. Exploiting this requires racing this transaction. Affected are all tokentypes whose values are only supposed to be used once, for example TOTP, HOTP and likely also WebAuthN.
Affected Combinations:
- MySQL (any version)
- MariaDB with innodb_snapshot_isolation=OFF
- innodb_snapshot_isolation was introduced in: MariaDB 10.6.18, MariaDB 10.11.8, MariaDB 11.0.6, MariaDB 11.1.5, MariaDB 11.2.4, MariaDB 11.4.2 with default OFF, can be turned ON as a workaround
- for MariaDB >= 11.6.2 the default is ON, which is not affected
- Same rules applies for Galera with underlying MariaDB
Patches
Fixed in version 2.9.1 by locking rows prior to write with SELECT FOR UPDATE.
Workarounds
Set innodb_snapshot_isolation to ON (default in MariaDB >= 11.6.2, e.g packaged in Debian 13).
Resources
https://mariadb.com/resources/blog/isolation-level-violation-testing-and-debugging-in-mariadb/
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | edumfa | < 2.9.1 | 2.9.1 |
References
- CVSS vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:L/SA:L- Weakness (CWE)
CWE-285- Platform
- Python (PyPI)
- Package
edumfa- Disclosed
- 18.05.2026
- Updated
- 11.10.2026 12:19
Sources and licenses
OSV / GitHub Advisory Database - GHSA-qq2p-4282-cfc5 - CC BY 4.0
Vulnerability history: edumfa
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 4
- First → latest
- 07.2024 05.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
- Medium 2
Disclosures per year
- 2024: 1
- 2025: 0
- 2026: 3
-
eduMFA: Incorrect InnoDB snapshot isolation possibly allows token reusage this entry
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