CVE-2015-7576

What it is

The http_basic_authenticate_with method in actionpack/lib/action_controller/metal/http_authentication.rb in the Basic Authentication implementation in Action Controller in Ruby on Rails before 3.2.22.1, 4.0.x and 4.1.x before 4.1.14.1, 4.2.x before 4.2.5.1, and 5.x before 5.0.0.beta1.1 does not use a constant-time algorithm for verifying credentials, which makes it easier for remote attackers to bypass authentication by measuring timing differences.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

4.9% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2016-02-16 02:59 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:32 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 4.9% in the next 30 days (EPSS).
• Severity: 3.7 LOW (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2016-02-16 02:59 UTC

Last modified

2026-06-17 00:32 UTC

Exploit probability

4.9% · EPSS, next 30 days

Weakness

CWE-254

Record status

Modified

Affected

• Rubyonrails Rails 4.0.0
• Rubyonrails Rails 4.0.1
• Rubyonrails Rails 4.0.2
• Rubyonrails Rails 4.0.3
• Rubyonrails Rails 4.0.4
• Rubyonrails Rails 4.0.5
• Rubyonrails Rails 4.0.6
• Rubyonrails Rails 4.0.7

Attack profile CVSS 3.0 · 3.7

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2015-7576.md and follow it. Check whether this project is affected by CVE-2015-7576. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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