How severe is CVE-2025-54982?

CVE-2025-54982 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2025-54982 being actively exploited?

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

How do I fix CVE-2025-54982?

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

Does CVE-2025-54982 have an EU (EUVD) identifier?

Yes. CVE-2025-54982 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-23602.

When was CVE-2025-54982 published?

CVE-2025-54982 was published on 2025-08-05 and last updated on 2026-06-17.

CVE-2025-54982

CVE-2025-54982 is a critical-severity vulnerability with a CVSS 3.x base score of 9.6. 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-347.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-23602
Weakness: CWE-347
Published: 2025-08-05
Last modified: 2026-06-17

Description

An improper verification of cryptographic signature in Zscaler's SAML authentication mechanism on the server-side allowed an authentication abuse.

Frequently asked questions

What is CVE-2025-54982?: An improper verification of cryptographic signature in Zscaler's SAML authentication mechanism on the server-side allowed an authentication abuse.
How severe is CVE-2025-54982?: CVE-2025-54982 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2025-54982 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-54982?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-54982 have an EU (EUVD) identifier?: Yes. CVE-2025-54982 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-23602.
When was CVE-2025-54982 published?: CVE-2025-54982 was published on 2025-08-05 and last updated on 2026-06-17.

References

https://help.zscaler.com/zia/about-identity-providers

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