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Response snapshot Oct 28, 2026, 17:11 UTC

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VulnerabilityCVE-2026-53660

OpenAM Insecure SSO Cookie Initialization

Description An Insecure Default Initialization of Resource (CWE-1188) issue in the OpenAM default configuration ships the iPlanetDirectoryPro SSO cookie with HttpOnly=false. Also, the iPlanetDirectoryPro SSO cookie is used as a CSRF token in OAuth/OIDC flows.

At a glance

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

What to do

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

Read GitHub-reviewed advisory GHSA-fpmh-vx4h-xc33 (opens a new tab)

What happened

Summary

Description An Insecure Default Initialization of Resource (CWE-1188) issue in the OpenAM default configuration ships the iPlanetDirectoryPro SSO cookie with HttpOnly=false. Also, the iPlanetDirectoryPro SSO cookie is used as a CSRF token in OAuth/OIDC flows. This affects OpenAM Community Edition through version 16.0.6 and was patched in version 16.1.1.

Impact

A single click on an attacker link may yield full SSO session theft of any authenticated console user when chained with any other same-origin XSS in the OpenAM origin. The missing SameSite default also widens the CSRF surface. Also, because the consent flow reuses the SSO cookie as its CSRF token, any XSS in the OpenAM origin both steals the session and completes attacker-driven OAuth consent grants in one step.

Continue reading

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-core: < 16.1.1

Scores and how they were measured

CVSS base severity

7.0

Version 4.0As of

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/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-fpmh-vx4h-xc33 (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-fpmh-vx4h-xc33, 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 Insecure SSO Cookie Initialization (CVE-2026-53660). https://kevwire.com/record/CVE-2026-53660

MLA

"OpenAM Insecure SSO Cookie Initialization (CVE-2026-53660)." KEVWire, 28 Oct. 2026, kevwire.com/record/CVE-2026-53660.

Chicago

KEVWire. "OpenAM Insecure SSO Cookie Initialization (CVE-2026-53660)." Last modified October 28, 2026. https://kevwire.com/record/CVE-2026-53660.

Evidence summary (plain text)

OpenAM Insecure SSO Cookie Initialization (Aug 14, 2026).
Description
An Insecure Default Initialization of Resource (CWE-1188) issue in the OpenAM default configuration ships the iPlanetDirectoryPro SSO cookie with HttpOnly=false. Also, the iPlanetDirectoryPro SSO cookie is used as a CSRF token in OAuth/OIDC flows. This affects OpenAM Community Edition through version 16.0.6 and was patched in version 16.1.1.

A single click on an attacker link may yield full SSO session theft of any authenticated console user when chained with any other same-origin XSS in the OpenAM origin. The missing SameSite default also widens the CSRF surface.
CVSS 7.0 (version 4.0; evidence as of Oct 28, 2026; https://github.com/advisories/GHSA-fpmh-vx4h-xc33).
Sources:
GitHub-reviewed advisory GHSA-fpmh-vx4h-xc33: https://github.com/advisories/GHSA-fpmh-vx4h-xc33
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: CVE-2026-53660.
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.

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Record details

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