How severe is CVE-2026-53660?

CVE-2026-53660 has a CVSS 4.0 base score of 7.4, rated high severity.

Is CVE-2026-53660 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-53660?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-53660 published?

CVE-2026-53660 was published on 2026-09-15.

CVE-2026-53660

CVE-2026-53660 is a high-severity vulnerability with a CVSS 4.0 base score of 7.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1004.

Key facts

Severity: High (CVSS 4.0 base score 7.4)
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1004
Published: 2026-09-15
Last modified: 2026-09-15

Description

Open Access Management (OpenAM) is an access management solution. Prior to 16.1.1, the default configuration initializes the iPlanetDirectoryPro SSO cookie with HttpOnly disabled and without a protective SameSite default, and OAuth and OpenID Connect consent flows reuse that cookie through CsrfProtection as a CSRF token. When combined with same-origin cross-site scripting and a user following an attacker-controlled link, the cookie can be read and reused to steal the SSO session and complete attacker-driven consent grants. This issue is fixed in version 16.1.1.

Frequently asked questions

What is CVE-2026-53660?: Open Access Management (OpenAM) is an access management solution. Prior to 16.1.1, the default configuration initializes the iPlanetDirectoryPro SSO cookie with HttpOnly disabled and without a protective SameSite default, and OAuth and OpenID Connect consent flows reuse that cookie through CsrfProtection as a CSRF token. When combined with same-origin cross-site scripting and a user following an attacker-controlled link, the cookie can be read and reused to steal the SSO session and complete attacker-driven consent grants. This issue is fixed in version 16.1.1.
How severe is CVE-2026-53660?: CVE-2026-53660 has a CVSS 4.0 base score of 7.4, rated high severity.
Is CVE-2026-53660 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-53660?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-53660 published?: CVE-2026-53660 was published on 2026-09-15.

References

Other CWE-1004 vulnerabilities

CVE-2025-26844 — Critical (CVSS 9.8): An issue was discovered in Znuny through 7.1.3. A cookie is set without the HttpOnly flag.
CVE-2026-22081 — High (CVSS 8.8): This vulnerability exists in Tenda wireless routers (300Mbps Wireless Router F3 and N300 Easy Setup Router) due to the…
CVE-2026-42239 — High (CVSS 8.1): Budibase is an open-source low-code platform. Prior to version 3.35.10, the budibase:auth cookie containing the JWT…
CVE-2025-27223 — High (CVSS 7.5): TRUfusion Enterprise through 7.10.4.0 exposes the encrypted COOKIEID as an authentication mechanism for some endpoints…
CVE-2025-24318 — Medium (CVSS 6.8): Cookie policy is observable via built-in browser tools. In the presence of XSS, this could lead to full session…
CVE-2026-0696 — Medium (CVSS 6.5): In ConnectWise PSA versions older than 2026.1, certain session cookies were not set with the HttpOnly attribute. In…

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