Password Shucking Vulnerability
Impact
An improper implementation was found in the password storage process.
All hashed passwords stored in Shield v1.0.0-beta.3 or earlier are easier to crack than expected due to the vulnerability. Therefore, they should be removed as soon as possible.
If an attacker gets (1) the user's hashed password by Shield, and (2) the hashed password (SHA-384 hash without salt) from somewhere, the attacker may easily crack the user's password.
Patches
Upgrade to Shield v1.0.0-beta.4 or later.
After upgrading, all users’ hashed passwords should be updated (saved to the database). See https://github.com/codeigniter4/shield/blob/develop/UPGRADING.md for details.
Workarounds
None.
References
- https://cheatsheetseries.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html#pre-hashing-passwords
- https://blog.ircmaxell.com/2015/03/security-issue-combining-bcrypt-with.html
- https://www.scottbrady91.com/authentication/beware-of-password-shucking
For more information
If you have any questions or comments about this advisory:
- Open an issue or discussion in codeigniter4/shield
- Email us at security@codeigniter.com
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | codeigniter4/shield | < 1.0.0-beta.4 | 1.0.0-beta.4 |
References
- https://github.com/codeigniter4/shield/security/advisories/GHSA-c5vj-f36q-p9vg
- https://nvd.nist.gov/vuln/detail/CVE-2023-27580
- https://github.com/codeigniter4/shield/commit/ea9688dd01d100193d834117dbfc2cfabcf9ea0b
- https://blog.ircmaxell.com/2015/03/security-issue-combining-bcrypt-with.html
- https://cheatsheetseries.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html#pre-hashing-passwords
- https://github.com/codeigniter4/shield
- https://github.com/codeigniter4/shield/blob/develop/UPGRADING.md
- https://www.scottbrady91.com/authentication/beware-of-password-shucking
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N- Weakness (CWE)
CWE-916- Platform
- Composer
- Package
codeigniter4/shield- Disclosed
- 13.03.2023
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-c5vj-f36q-p9vg - CC BY 4.0
Vulnerability history: codeigniter4/shield
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 4
- First → latest
- 08.2022 11.2023
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Medium 4
Disclosures per year
- 2022: 1
- 2023: 3
- 2024: 0
- 2025: 0
- 2026: 0
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