Is CVE-2026-8368 in the CISA KEV catalog?

No. CVE-2026-8368 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-8368?

CVE-2026-8368 has a CVSS v3 base score of 5.3 (Moderate).

What is the EPSS score for CVE-2026-8368?

CVE-2026-8368 has an EPSS score of 0.27% (18th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-8368?

Upgrade libwww-perl on debian unstable to 6.83-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2026-8368

MEDIUM

5.3

CVSS v3

NVD

Description

LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirects. On a 3xx response, the redirect handler strips only Host and Cookie before issuing the follow-up request. Caller-supplied Authorization and Proxy-Authorization headers are sent unchanged to the redirect target, including across scheme, host, or port changes. A redirect to an attacker controlled host therefore discloses the caller's credentials to that host.

CWE-522

How to fix

Remediation Available

libwww-perlDebian

Fixed in:6.83-1CVE-2026-8368

libwww-perlUbuntu

Fixed in:6.61-1ubuntu0.1USN-8378-1

Fixed in:6.76-1ubuntu0.1USN-8378-1

Fixed in:6.78-1ubuntu0.1USN-8378-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

Exploit Intelligence

0.27%probability of exploitation in 30 days

18thpercentile

Low risk: more likely to be exploited than 18% of all known CVEs.

References

Other references5

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-19.