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Response snapshot Oct 28, 2026, 17:11 UTC

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VulnerabilityCVE-2026-46623

OpenAM Account Takeover via Unverified Password Change in OAuth2 Module

Description An Unverified Password Change (CWE-620) and Use of Weak Credentials (CWE-1391) issue in OpenAM's OAuth2 authentication module silently rewrites a local user's password to the literal string of their username on OAuth2 re-login of an existing account.

At a glance

Exploited
Not known
Severity
8.7 High (CVSS 4.0)
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: org.openidentityplatform.openam:openam-auth-oauth2: 16.1.1. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-gf57-4mp6-m85x (opens a new tab)

What happened

Summary

Description

An Unverified Password Change (CWE-620) and Use of Weak Credentials (CWE-1391) issue in OpenAM's OAuth2 authentication module silently rewrites a local user's password to the literal string of their username on OAuth2 re-login of an existing account.

The default ldapService chain then accepts the username as the password for that user, allowing an unauthenticated attacker to obtain a session via the standard authenticate endpoint with both username and password set to the username, without any IdP interaction. This affects OpenAM Community Edition through version 16.0.6 and was patched in version 16.1.1.

Continue reading

Impact

OpenAM Community Edition deployments through version 16.0.6 that use the OAuth2 authentication module with account creation enabled (the default) are potentially affected. After two OAuth logins of a given user, that user's local password becomes their username, and the account is reachable through the default ldapService chain with username as both identifier and password.

For pre-existing users whose IdP profile resolves against an existing local identifier, the rewrite fires on the very first re-login.

Usernames shorter than the default minimum password length have the rewrite silently denied (so very short administrative accounts are not affected), and the same update path marks accounts active on every OAuth login, silently reactivating disabled accounts.

Successful exploitation grants an unauthenticated attacker a session carrying the victim principal's privileges.

Patch

This has been patched in OpenAM Community Edition version 16.1.1. Users are encouraged to update to the latest release.

Affected package ranges reported by GitHub: org.openidentityplatform.openam:openam-auth-oauth2: < 16.1.1

Scores and how they were measured

CVSS base severity

8.7

Version 4.0As of

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-gf57-4mp6-m85x (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-gf57-4mp6-m85x, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 28). OpenAM Account Takeover via Unverified Password Change in OAuth2 Module (CVE-2026-46623). https://kevwire.com/record/CVE-2026-46623

MLA

"OpenAM Account Takeover via Unverified Password Change in OAuth2 Module (CVE-2026-46623)." KEVWire, 28 Oct. 2026, kevwire.com/record/CVE-2026-46623.

Chicago

KEVWire. "OpenAM Account Takeover via Unverified Password Change in OAuth2 Module (CVE-2026-46623)." Last modified October 28, 2026. https://kevwire.com/record/CVE-2026-46623.

Evidence summary (plain text)

OpenAM Account Takeover via Unverified Password Change in OAuth2 Module (Jun 26, 2026).
Description

An Unverified Password Change (CWE-620) and Use of Weak Credentials (CWE-1391) issue in OpenAM's OAuth2 authentication module silently rewrites a local user's password to the literal string of their username on OAuth2 re-login of an existing account. The default ldapService chain then accepts the username as the password for that user, allowing an unauthenticated attacker to obtain a session via the standard authenticate endpoint with both username and password set to the username, without any IdP interaction.
CVSS 8.7 (version 4.0; evidence as of Oct 28, 2026; https://github.com/advisories/GHSA-gf57-4mp6-m85x).
Sources:
GitHub-reviewed advisory GHSA-gf57-4mp6-m85x: https://github.com/advisories/GHSA-gf57-4mp6-m85x
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: CVE-2026-46623.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 28, 2026, 16:55 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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Record details

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