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HIGH severity

CVE-2018-1000165 — lightsaml

HIGHFix: lightSAML/lightSAML@47cef07

CVE-2018-1000165 is a high-severity (CVSS 7.5) CWE-732 vulnerability in lightsaml/lightsaml. A fix is available for lightsaml/lightsaml — see the affected versions and patch details below.

LightSAML Incorrect Access Control vulnerability

Also known asGHSA-vg4f-8v9q-5c3x
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs69th percentile — riskier than 69% of all scored CVEsHighest risk
0.00%0.59%1.18%1.77%0.2%1.2%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘lightsaml/lightsaml

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

LightSAML version prior to 1.3.5 contains a Incorrect Access Control vulnerability in signature validation in readers in src/LightSaml/Model/XmlDSig/ that can result in impersonation of any user from Identity Provider. This vulnerability appears to have been fixed in 1.3.5 and later.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistlightsaml/lightsamlall versions1.3.5composer require lightsaml/lightsaml:^1.3.5

Affected Products

1 product · 1 configurations
Application
lightsamllightsaml
< 1.3.5
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for lightsaml/lightsaml, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update lightsaml/lightsaml to 1.3.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-1000165 is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

LightSAML version prior to 1.3.5 contains a Incorrect Access Control vulnerability in signature validation in readers in src/LightSaml/Model/XmlDSig/ that can result in impersonation of any user from Identity Provider. This vulnerability appears to have been fixed in 1.3.5 and later.
O3 Security · Impact-Aware SCA

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CVE-2018-1000165: lightsaml — Fixed in 1.3.5