How severe is CVE-2026-93748?

CVE-2026-93748 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-93748 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-93748?

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.

When was CVE-2026-93748 published?

CVE-2026-93748 was published on 2026-09-18 and last updated on 2026-09-23.

CVE-2026-93748

CVE-2026-93748 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. 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-524.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.7
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-524
Published: 2026-09-18
Last modified: 2026-09-23

Description

http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users. Attackers can request the same URL with a large max-stale value to obtain another user's Set-Cookie session credentials from shared-cache entries that were deliberately zeroed for security reasons.

Frequently asked questions

What is CVE-2026-93748?: http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users. Attackers can request the same URL with a large max-stale value to obtain another user's Set-Cookie session credentials from shared-cache entries that were deliberately zeroed for security reasons.
How severe is CVE-2026-93748?: CVE-2026-93748 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-93748 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-93748?: 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.
When was CVE-2026-93748 published?: CVE-2026-93748 was published on 2026-09-18 and last updated on 2026-09-23.

References

Other CWE-524 vulnerabilities

CVE-2026-53943 — Critical (CVSS 9.6): Ghost is a Node.js content management system. From until 6.37.0, when Ghost is behind a shared caching layer that…
CVE-2026-19202 — Critical (CVSS 9.1): A caching flaw in the toolbox-core package of the mcp-toolbox-sdk-python SDK causes the same Google ID token to be…
CVE-2025-64762 — Critical (CVSS 9.1): The AuthKit library for Next.js provides convenient helpers for authentication and session management using WorkOS &…
CVE-2026-61836 — High (CVSS 8.6): Directus is a real-time API and App dashboard for managing SQL database content. Prior to 12.0.0, when response caching…
CVE-2026-71316 — High (CVSS 7.5): Nuxt is an open-source web development framework for Vue.js. From 4.4.0 until 4.5.1, runtime cache:nuxt:payload entries…
CVE-2026-65755 — High (CVSS 7.5): Joomla Extension - regularlabs.com - Date-sensitive query-cache leakage in Articles Anywhere and Users Anywhere…

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