CVE-2026-123543

OpenAM before 16.1.4 Unauthenticated DoS via Unbounded Java Deserialisation

Products / packages OpenIdentityPlatform OpenAM

Published 08/11/2026, 01:37:49 UTC

Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 15/11/2026, 01:10:30 UTC

VulnCheck · CVSS:4.0 · 8.7

Assessment vector

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

VulnCheck · CVSS:3.1 · 7.5

Assessment vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

The headline uses the highest imported catalog score. Assessments can differ by source and CVSS version.

Severity

high8.7

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

OpenAM before version 16.1.4 is vulnerable to a denial of service attack, allowing unauthenticated attackers to exhaust server resources by sending serialized Java data without size or structure limits. Attackers can send crafted requests to block authentication and policy decisions. The weakness is due to allocation of resources without limits or throttling.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

OpenIdentityPlatform · VulnCheck

OpenAM

2 ranges

VulnCheck version evidence

Package identity

pkg:maven/org.openidentityplatform.openam/openam-sharedExplore org.openidentityplatform.openam:openam-shared →

Identity supplied by VulnCheck. Version matching requires compatible range evidence.

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → before 16.1.4

semver versions

unaffected

16.1.4

semver versions

Other versions: unaffected

OpenIdentityPlatform · VulnCheck

OpenAM

2 ranges

VulnCheck version evidence

Package identity

pkg:maven/org.openidentityplatform.openam/openam-coreExplore org.openidentityplatform.openam:openam-core →

Identity supplied by VulnCheck. Version matching requires compatible range evidence.

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → before 16.1.4

semver versions

unaffected

16.1.4

semver versions

Other versions: unaffected

OpenIdentityPlatform · VulnCheck

OpenAM

2 ranges

VulnCheck version evidence

Package identity

pkg:maven/org.openidentityplatform.openam/openam-clientsdkExplore org.openidentityplatform.openam:openam-clientsdk →

Identity supplied by VulnCheck. Version matching requires compatible range evidence.

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → before 16.1.4

semver versions

unaffected

16.1.4

semver versions

Other versions: unaffected

OpenIdentityPlatform · VulnCheck

OpenAM

2 ranges

VulnCheck version evidence

Package identity

pkg:maven/org.openidentityplatform.openam/openam-server-onlyExplore org.openidentityplatform.openam:openam-server-only →

Identity supplied by VulnCheck. Version matching requires compatible range evidence.

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → before 16.1.4

semver versions

unaffected

16.1.4

semver versions

Other versions: unaffected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

OpenAM before 16.1.4 contains a denial of service vulnerability that allows unauthenticated attackers to exhaust server resources by sending serialized Java data without size or structure limits. Attackers can send small crafted requests to remote SDK endpoints, classic login pages, or the administration console to block authentication, session validation and policy decisions.

References

2 sources

OpenIdentityPlatform/OpenAM · security/advisories/GHSA-x7wr-5gxg-v833

Vendor advisoryVulnCheck

www.vulncheck.com/advisories/openam-before-16.1.4-unauthenticated-dos-via-unbounded-java-deserialisation

Security advisoryVulnCheck

Inside the record

Evidence available

Package identity

Version evidence

Remediation guidance · not supplied

Weakness classification

Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-123543

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-770 ↗

Allocation of Resources Without Limits or Throttling

VulnCheck

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

VulnCheck · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:a:openidentityplatform:openam:*:*:*:*:*:*:*:*

From (inclusive):

After:

Through (inclusive):

Before: 16.1.4

Any condition may hold

Vulnerable product

cpe:2.3:a:openidentityplatform:openam:*:*:*:*:*:*:*:*

From (inclusive):

After:

Through (inclusive):

Before: 16.1.4

Any condition may hold

Vulnerable product

cpe:2.3:a:openidentityplatform:openam:*:*:*:*:*:*:*:*

From (inclusive):

After:

Through (inclusive):

Before: 16.1.4

Any condition may hold

Vulnerable product

cpe:2.3:a:openidentityplatform:openam:*:*:*:*:*:*:*:*

From (inclusive):

After:

Through (inclusive):

Before: 16.1.4

Applicability preview

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Contributing organizations · 2

VulnCheck

Assigning organization

2026-11-08

CISA-ADP

Additional data publisher

2026-11-12

Timeline

All times UTC

8 Nov 2026, 01:37
Advisory published
Publication date supplied by the source.
12 Nov 2026, 14:08
Source updated
Latest modification date supplied by the source.
12 Nov 2026, 21:24
Last imported by cve.new
Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes

CVE · CVE-2026-1235432026-11-12

Observed 2026-11-12T21:24:04.347Z · upstream updated 2026-11-12T14:08:49.224Z

Prioritization updated

before

[]

after

[
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-11-12T14:08:28.633965Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "yes"
      },
      {
        "name": "Technical Impact",
        "value": "partial"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

Reading the signals

Severity · CVSS: Technical impact and attack conditions. The headline is the highest imported catalog score; sources may disagree.
Observed exploitation · KEV: An absent or unavailable KEV listing does not establish that exploitation has not occurred.
Predicted exploitation · EPSS: No EPSS estimate available in this record.

CISA-ADP · SSVC

CISA Coordinator · 2026-11-12

Exploitation: none
Automatable: yes
Technical Impact: partial

SSVC describes the publisher’s decision context. Your organization’s exposure and priorities may differ.

Record identifiers

Aliases: None recorded

Source evidence

Request a correction or dispute

Start with the assigning organization for this record. Include the CVE ID, the disputed information, and supporting evidence. A dispute does not itself reject a record.

Find the responsible CNA →Official dispute and escalation process ↗

CVE CVE-2026-123543