Security Digest · Vulnerability record
CVE-2024-45409: SAML authentication bypass via Incorrect XPath selector
The Ruby SAML library is for implementing the client side of a SAML authorization.
CVSS 9.9 Critical EPSS 10.7% · p96
Should you act?
High exploit likelihood
EPSS ranks it in the top 5% of all CVEs for likely exploitation in the next 30 days. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Not in CISA KEV, but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 10.7%, percentile 96: FIRST’s model estimates a 10.7% chance of exploitation activity in the next 30 days, higher than 96% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes
ruby-saml(RubyGems) < 1.12.3, fixed in 1.12.3;ruby-saml(RubyGems) >= 1.13.0, < 1.17.0, fixed in 1.17.0. Check your lockfile, including transitive dependencies.
What it is
The Ruby SAML library is for implementing the client side of a SAML authorization. Ruby-SAML in
From the GitHub advisory
Ruby-SAML in
This vulnerability was reported by ahacker1 of SecureSAML (ahacker1@securesaml.com)
Weakness type: CWE-347.
Product: ruby-saml (RubyGems) · Assigned by: GitHub_M · Published: 2024-09-10
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| RubyGems | ruby-saml | < 1.12.3 | 1.12.3 |
| RubyGems | ruby-saml | >= 1.13.0, < 1.17.0 | 1.17.0 |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| SAML-Toolkits | ruby-saml | < 1.12.3, >= 1.13.0, < 1.17.0 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_M | 3.1 | 10 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N |
| GitHub | 4.0 | 9.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Attack requirements: none
- Privileges required: none (no login)
- User interaction: none
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc, automatable yes, technical impact total.
- FIRST EPSS (model of 2026-10-21): 10.68% probability of exploitation activity in the next 30 days; percentile 96.
Timeline
- — CVE record published by GitHub_M
- — GitHub-reviewed advisory GHSA-jw9c-mfg7-9rx2 published (critical)
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-jw9c-mfg7-9rx2 github.com
- CVE.org record CVE-2024-45409 cve.org
- NVD entry CVE-2024-45409 nvd.nist.gov
Other references from the CVE record and advisory
- github.com github.com
- github.com github.com
- github.com github.com
- github.com github.com
- ssoready.com ssoready.com
- news.ycombinator.com news.ycombinator.com
- security.netapp.com security.netapp.com
- lists.debian.org lists.debian.org
- github.com github.com
- github.com github.com
- github.com github.com
- github.com github.com