Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-123540— OpenAM before 16.1.4 Incomplete Attribute Encoding in SAML 1.x Form POST

Quick assessment

Affected
OpenIdentityPlatform OpenAM
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

16.1.4 之前的 OpenAM 存在输出编码不完整漏洞，允许 SAML 1.x 身份提供者通过向服务提供者自动提交的表单中注入未编码内容，从而篡改属性值。控制受信任身份提供者的攻击者可构造断言属性名称或属性值，使其以被修改的形式到达目标应用，从而破坏所接收属性的完整性。

CVSS 2.0 · Low

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-123540

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
OpenAM before 16.1.4 Incomplete Attribute Encoding in SAML 1.x Form POST
Source: CVE Program / CVE List V5
Vulnerability Description
OpenAM before 16.1.4 contains an incomplete output encoding vulnerability that allows a SAML 1.x identity provider to alter attribute values by injecting unencoded content into the service provider auto-submitted form. Attackers controlling a trusted identity provider can craft assertion attribute names or values that reach the target application in modified form, undermining the integrity of received attributes.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对输出编码和转义不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenIdentityPlatform OpenAM 0 ~ 16.1.4 -

II. Public POCs for CVE-2026-123540

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-123540

请登录查看更多情报信息。

Other References for CVE-2026-123540 (2)

Same Patch Batch · OpenIdentityPlatform · 2026-11-08 · 18 CVEs total

CVE-2026-123551 10.0 CRITICAL OpenAM 14.0.0 before 16.1.4 Session Token Disclosure via Notification WebSocket
CVE-2026-123550 9.8 CRITICAL OpenAM before 16.1.4 SAML Authentication Bypass via Unsigned Assertions
CVE-2026-123549 9.8 CRITICAL OpenAM before 16.1.4 Privilege Escalation via Self-Registration Attribute Bypass
CVE-2026-123543 7.5 HIGH OpenAM before 16.1.4 Unauthenticated DoS via Unbounded Java Deserialisation
CVE-2026-123545 7.1 HIGH OpenAM 14.5.1 before 16.1.4 CSRF in OAuth 2.0 Device Flow
CVE-2026-123544 6.8 MEDIUM OpenAM before 16.1.4 Insufficient Response Validation in Internal SOAP Channel
CVE-2026-123542 6.8 MEDIUM OpenAM before 16.1.4 PKCE Bypass in OAuth 2.0 Device Authorization Flow
CVE-2026-123538 6.6 MEDIUM OpenAM before 16.1.4 SAML 1.x Signature Verification Issuer Impersonation
CVE-2026-123552 6.5 MEDIUM OpenAM before 16.1.4 SSRF and CRL Tampering via Certificate CRL Distribution Point
CVE-2026-123553 6.5 MEDIUM OpenAM before 16.1.4 Default Credentials in Built-in Accounts Allow Unauthenticated Login
CVE-2026-123546 6.1 MEDIUM OpenAM before 16.1.4 Open Redirect and XSS via goto and gotoOnFail
CVE-2026-123537 5.0 MEDIUM OpenAM before 16.1.4 SSRF via UMA Scope Description URLs
CVE-2026-123539 4.8 MEDIUM OpenAM before 16.1.4 Stored XSS via OAuth 2.0 Consent Page Display Name
CVE-2026-123541 4.7 MEDIUM OpenAM before 16.1.4 Open Redirect via SAML 1.x Trusted-Partner Matching
CVE-2026-123548 4.7 MEDIUM OpenAM before 16.1.4 Open Redirect via WS-Federation and SAML v2.0 Pages
CVE-2026-123547 4.7 MEDIUM OpenAM before 16.1.4 Open Redirect via SAML v2.0 RelayState
CVE-2026-123536 4.1 MEDIUM OpenAM before 16.1.4 SSRF via Federation Configuration Wizard Metadata URLs

IV. Related Vulnerabilities

Same product: OpenAM
Same vendor: OpenIdentityPlatform
Same weakness: CWE-116