CVE-2025-54982
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedAn improper verification of cryptographic signature in Zscaler's SAML authentication mechanism on the server-side allowed an authentication abuse.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThe vulnerability allows attackers to bypass SAML signature verification on Zscaler's server-side authentication, enabling forged SAML assertions to be accepted as valid. This permits unauthorized authentication and access to protected resources by manipulating the cryptographic signature validation process.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm Zscaler SAML authentication is in useReview your identity provider (IdP) and service provider (SP) configurations to verify Zscaler is configured as a SAML service provider. Check Zscaler admin console under 'Administration > SAML' or 'Authentication' settings for active SAML configurations.Affected if Zscaler is configured as a SAML service provider handling user authentication
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Identify Zscaler product and versionLocate your Zscaler version in the admin console under 'Administration > System Upgrade' or 'Settings'. Note whether you use Zscaler Internet Access (ZIA), Zscaler Private Access (ZPA), or Zscaler Cloud Protection (ZCP).Affected if Running an unpatched version of Zscaler that has not received the CVE-2025-54982 fix
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Verify SAML signature verification is enabledIn Zscaler admin console, navigate to 'Administration > SAML Settings' or the SAML configuration page for your IdP. Locate the 'Verify Signature' or 'Signature Required' option and confirm it is enabled or set to 'Always'. Check for any bypass settings.Affected if SAML signature verification is disabled, optional, or set to bypass for incoming assertions
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Inspect SAML assertion validation settingsReview the SAML IdP configuration in Zscaler for fields related to certificate validation, including 'Validate Assertion Certificate' or 'Enforce Signed Assertions'. Confirm these are set to require valid cryptographic signatures.Affected if Certificate validation is not enforced or is set to optional for SAML assertions
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Check SAML IdP metadata integrityReview the imported IdP metadata in Zscaler under 'Administration > SAML > IdP Metadata'. Verify the X.509 certificate displayed matches your trusted IdP certificate and has not been replaced or tampered with.Affected if IdP metadata contains unexpected certificates or the signing certificate differs from the known trusted source
You are affected if you use Zscaler SAML authentication and either run an unpatched version or have SAML signature verification disabled or not properly enforced on incoming assertions.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply the vendor-supplied patch for CVE-2025-54982 to Zscaler products immediately. If patching is delayed, review SAML IdP configurations and consider additional logging/monitoring for anomalous authentication patterns.
- Consultation2.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA3.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-54982 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-54982 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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