How severe is CVE-2026-34236?

CVE-2026-34236 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-34236 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34236?

CVE-2026-34236 affects Auth0 Auth0-php. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34236?

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.

Does CVE-2026-34236 have an EU (EUVD) identifier?

Yes. CVE-2026-34236 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17979.

When was CVE-2026-34236 published?

CVE-2026-34236 was published on 2026-04-01 and last updated on 2026-06-17.

CVE-2026-34236

CVE-2026-34236 is a high-severity vulnerability in Auth0 Auth0-php with a CVSS 3.x base score of 8.2. 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-331.

Key facts

Severity: High (CVSS 3.x base score 8.2)
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17979
Weakness: CWE-331
Affected product: Auth0 Auth0-php
Published: 2026-04-01
Last modified: 2026-06-17

Description

Auth0-PHP is a PHP SDK for Auth0 Authentication and Management APIs. From version 8.0.0 to before version 8.19.0, in applications built with the Auth0 PHP SDK, cookies are encrypted with insufficient entropy, which may result in threat actors brute-forcing the encryption key and forging session cookies. This issue has been patched in version 8.19.0.

Frequently asked questions

What is CVE-2026-34236?: Auth0-PHP is a PHP SDK for Auth0 Authentication and Management APIs. From version 8.0.0 to before version 8.19.0, in applications built with the Auth0 PHP SDK, cookies are encrypted with insufficient entropy, which may result in threat actors brute-forcing the encryption key and forging session cookies. This issue has been patched in version 8.19.0.
How severe is CVE-2026-34236?: CVE-2026-34236 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-34236 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34236?: CVE-2026-34236 affects Auth0 Auth0-php. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34236?: 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.
Does CVE-2026-34236 have an EU (EUVD) identifier?: Yes. CVE-2026-34236 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17979.
When was CVE-2026-34236 published?: CVE-2026-34236 was published on 2026-04-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:auth0:auth0-php:*:*:*:*:*:*:*:*

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