LDAP Account Manager: WebAuthn authentication challenge is kept in the PHP session

Description

LDAP Account Manager (LAM) is a webfrontend for managing entries (e.g. users, groups, DHCP settings) stored in an LDAP directory. Prior to 9.6, installations with WebAuthn two-factor authentication leave the challenge in the same PHP session after the authentication response is processed. A user who has already completed valid password authentication can therefore retain the same signed WebAuthn ceremony state instead of consuming it once. The practical risk is limited by the requirement for a valid password, the same PHP session, and a valid authenticator signature. This issue is fixed in version 9.6.

Scores

EPSS (exploitation in 30 days)

0.21% · top 89% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.2.

Weakness

• CWE-294: Authentication Bypass by Capture-replay (opens in a new tab)All about CWE-294 and its CVEs

Affected products

• LDAPAccountManager · lam

  • affected < 9.6

References (3)

• https://github.com/LDAPAccountManager/lam/security/advisories/GHSA-xgjg-fchx-x3g3 (opens in a new tab)x_refsource_CONFIRM
• https://github.com/LDAPAccountManager/lam/commit/a56dcaab3e0f572283f5861404ed58d5ea301bc6 (opens in a new tab)x_refsource_MISC
• https://github.com/LDAPAccountManager/lam/releases/tag/9.6 (opens in a new tab)x_refsource_MISC

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-55167](https://trackcve.app/badge/CVE-2026-55167.svg)](https://trackcve.app/cve/CVE-2026-55167)

Record last updated 20 Oct 2026, 01:48 UTC.