CVE-2018-1000165: LightSAML version prior to 1.3.5 contains a Incorrect Access Control vulnerability in signature validation in

Q: How do I fix CVE-2018-1000165?

lightsaml: upgrade to 1.3.5. Exact commands for each OS are on this page.

Q: Is CVE-2018-1000165 being exploited?

CVE-2018-1000165 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-1000165 affect?

CVE-2018-1000165 affects lightsaml. Severity is high (CVSS 7.5). 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 ap

Q: How urgent is CVE-2018-1000165?

Priority 48/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2018-1000165 is a high-severity flaw (CVSS 7.5) affecting lightsaml. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-732
Published	2018-04-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: lightsaml

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-04-18 19:29 UTCPublished CVE record published
2026-06-17 01:32 UTCUpdated Record last modified

lightsaml lightsaml UPGRADE

Affected: < 1.3.5

Fixed in: 1.3.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy lightsaml || rpm -q lightsaml || lightsaml --version

2. UPGRADE to 1.3.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade lightsaml

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade lightsaml

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-1000165?

lightsaml: upgrade to 1.3.5. Exact commands for each OS are on this page.

Is CVE-2018-1000165 being exploited?

CVE-2018-1000165 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-1000165 affect?

CVE-2018-1000165 affects lightsaml. Severity is high (CVSS 7.5). 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 ap

How urgent is CVE-2018-1000165?

Priority 48/100. High severity; Remotely exploitable, no login, no user action

References

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