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.

The version of perl-libwww-perl installed on the remote host is prior to 6.05-2. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3325 advisory.

    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.
    (CVE-2026-8368)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1764 advisory.

    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.
    (CVE-2026-8368)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-3b48ba7dc7 advisory.

    Changes:

    6.83      2026-05-12 11:41:48Z

        - LWP::UserAgent now strips Authorization and Proxy-Authorization headers           on cross-origin redirects (a different scheme, host, or port) to prevent           credential leakage to the redirect target. Same-origin redirects retain           credentials. Opt out with allow_credentialed_redirects => 1.
          CVE-2026-8368 reported by Kai Zen; PoC and initial patch by Stig           Palmquist.
        - LWP::UserAgent now refuses https to http redirects by default to prevent           leaking remaining request headers and bodies over plaintext. Opt in with           allow_downgrade => 1. Related hardening alongside CVE-2026-8368; PoC by           Stig Palmquist.

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-8378-1 advisory.

    It was discovered that libwww-perl incorrectly handled redirects. A remote attacker could possibly use     this issue to obtain sensitive information by causing Authorization headers to be sent to a different     host.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-8d1333fb52 advisory.

    Changes:

    6.83      2026-05-12 11:41:48Z

        - LWP::UserAgent now strips Authorization and Proxy-Authorization headers           on cross-origin redirects (a different scheme, host, or port) to prevent           credential leakage to the redirect target. Same-origin redirects retain           credentials. Opt out with allow_credentialed_redirects => 1.
          CVE-2026-8368 reported by Kai Zen; PoC and initial patch by Stig           Palmquist.
        - LWP::UserAgent now refuses https to http redirects by default to prevent           leaking remaining request headers and bodies over plaintext. Opt in with           allow_downgrade => 1. Related hardening alongside CVE-2026-8368; PoC by           Stig Palmquist.

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-8368)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
319853	Amazon Linux 2 : perl-libwww-perl, --advisory ALAS2-2026-3325 (ALAS-2026-3325)	Nessus	Amazon Linux Local Security Checks	medium
319802	Amazon Linux 2023 : perl-libwww-perl, perl-libwww-perl-tests (ALAS2023-2026-1764)	Nessus	Amazon Linux Local Security Checks	medium
318762	Fedora 43 : perl-libwww-perl (2026-3b48ba7dc7)	Nessus	Fedora Local Security Checks	medium
318620	Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : libwww-perl vulnerability (USN-8378-1)	Nessus	Ubuntu Local Security Checks	medium
318058	Fedora 44 : perl-libwww-perl (2026-8d1333fb52)	Nessus	Fedora Local Security Checks	medium
315716	Linux Distros Unpatched Vulnerability : CVE-2026-8368	Nessus	Misc.	medium

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