HOMEVULNERABILITIESCVE-2023-27580
MEDIUM

CVE-2023-27580

CWE-916Published: March 13, 2023· Updated: Jun 17, 2026

5.9
CVSS v3.1

Official Description

CodeIgniter Shield provides authentication and authorization for the CodeIgniter 4 PHP framework. 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. Upgrade to Shield v1.0.0-beta.4 or later to fix this issue. After upgrading, all users’ hashed passwords should be updated (saved to the database). There are no known workarounds.

NVD Source

Technical Analysis

CVE-2023-27580 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.9.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

codeigniter1 product(s)
shield
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/codeigniter4/shield/commit/ea9688dd01d100193d834117dbfc2cfabcf9ea0b
PATCHhttps://github.com/codeigniter4/shield/commit/ea9688dd01d100193d834117dbfc2cfabcf9ea0b
ADVISORYhttps://blog.ircmaxell.com/2015/03/security-issue-combining-bcrypt-with.html
ADVISORYhttps://github.com/codeigniter4/shield/blob/develop/UPGRADING.md
ADVISORYhttps://github.com/codeigniter4/shield/security/advisories/GHSA-c5vj-f36q-p9vg
ADVISORYhttps://www.scottbrady91.com/authentication/beware-of-password-shucking
ADVISORYhttps://blog.ircmaxell.com/2015/03/security-issue-combining-bcrypt-with.html
ADVISORYhttps://github.com/codeigniter4/shield/blob/develop/UPGRADING.md
ADVISORYhttps://github.com/codeigniter4/shield/security/advisories/GHSA-c5vj-f36q-p9vg
ADVISORYhttps://www.scottbrady91.com/authentication/beware-of-password-shucking

All References (12)

→
https://blog.ircmaxell.com/2015/03/security-issue-combining-bcrypt-with.htmlThird Party Advisory
→
https://cheatsheetseries.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html#pre-hashing-passwordsNot Applicable
→
https://github.com/codeigniter4/shield/blob/develop/UPGRADING.mdVendor Advisory
→
https://github.com/codeigniter4/shield/commit/ea9688dd01d100193d834117dbfc2cfabcf9ea0bPatch
→
https://github.com/codeigniter4/shield/security/advisories/GHSA-c5vj-f36q-p9vgVendor Advisory
→
https://www.scottbrady91.com/authentication/beware-of-password-shuckingThird Party Advisory
→
https://blog.ircmaxell.com/2015/03/security-issue-combining-bcrypt-with.htmlThird Party Advisory
→
https://cheatsheetseries.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html#pre-hashing-passwordsNot Applicable
→
https://github.com/codeigniter4/shield/blob/develop/UPGRADING.mdVendor Advisory
→
https://github.com/codeigniter4/shield/commit/ea9688dd01d100193d834117dbfc2cfabcf9ea0bPatch
→
https://github.com/codeigniter4/shield/security/advisories/GHSA-c5vj-f36q-p9vgVendor Advisory
→
https://www.scottbrady91.com/authentication/beware-of-password-shuckingThird Party Advisory

Quick Facts

CVE IDCVE-2023-27580
CVSS Score5.9 / 10
SeverityMEDIUM
WeaknessCWE-916
CISA KEVNo
Affected1 vendor(s)
PublishedMar 13, 2023

Related CVEs (CWE-916)

CVE-2020-14516
10.0
CVE-2023-34433
9.8
CVE-2024-5743
9.8
CVE-2021-36767
9.8
CVE-2018-10618
9.8
CVE-2023-5846
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-27580 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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