CVE-2015-1401: Improper Authentication vulnerability in the "LDAP / SSO Authentication" (ig_ldap_sso_auth) extension 2.0.0 fo

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2015-1401 is a critical-severity flaw (CVSS 9.8) affecting ldap \/ sso authentication. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper Authentication vulnerability in the "LDAP / SSO Authentication" (ig_ldap_sso_auth) extension 2.0.0 for TYPO3.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Weakness	CWE-287
Published	2017-08-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ldap \/ sso authentication project

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

Am I affected?

Timeline

2017-08-28 15:29 UTCPublished CVE record published
2026-06-17 00:22 UTCUpdated Record last modified

ldap \/ sso authentication project ldap \/ sso authentication DOWNGRADE

Affected: 2.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy ldap--sso-authentication || rpm -q ldap--sso-authentication || ldap--sso-authentication --version

2. No fixed release: DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison ldap--sso-authentication sudo apt install ldap--sso-authentication=<VERSION_BEFORE_2.0.0> sudo apt-mark hold ldap--sso-authentication

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ldap--sso-authentication sudo dnf downgrade ldap--sso-authentication-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add ldap--sso-authentication

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2015-1401?

ldap \/ sso authentication: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-1401 being exploited?

CVE-2015-1401 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-2015-1401 affect?

CVE-2015-1401 affects ldap \/ sso authentication. Severity is critical (CVSS 9.8). Improper Authentication vulnerability in the "LDAP / SSO Authentication" (ig_ldap_sso_auth) extension 2.0.0 for TYPO3.

How urgent is CVE-2015-1401?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

TYPO3 vulnerabilities

References

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