When xdg-mail is configured to use thunderbird for mailto URLs, improper parsing of the URL can lead to additional headers being passed to thunderbird that should not be included per RFC 2368. An attacker can use this method to create a mailto URL that looks safe to users, but will actually attach files when clicked.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - When xdg-mail is configured to use thunderbird for mailto URLs, improper parsing of the URL can lead to
    additional headers being passed to thunderbird that should not be included per RFC 2368. An attacker can
    use this method to create a mailto URL that looks safe to users, but will actually attach files when
    clicked. (CVE-2022-4055)

The Rocky Linux 9 host has a package installed that is affected by a vulnerability as referenced in the CIQ crlsa-2025_7672 advisory.

    * xdg-utils: improper parse of mailto URIs allows bypass of Thunderbird security mechanism for attachments     (CVE-2022-4055)

Tenable has extracted the preceding description block directly from the CIQ 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 AlmaLinux 9.2 host has a package installed that is affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.2:CLSA-2025:1751913634 advisory.

  - A flaw was found in the xdg-email component of xdg-utils-1.1.0-rc1 and newer. When handling mailto: URIs,     xdg-email allows attachments to be discreetly added via the URI when being passed to Thunderbird. An     attacker could potentially send a victim a URI that automatically attaches a sensitive file to a new     email. If a victim user does not notice that an attachment was added and sends the email, this could     result in sensitive information disclosure. It has been confirmed that the code behind this issue is in     xdg-email and not in Thunderbird. (CVE-2020-27748)

  - When xdg-mail is configured to use thunderbird for mailto URLs, improper parsing of the URL can lead to     additional headers being passed to thunderbird that should not be included per RFC 2368. An attacker can     use this method to create a mailto URL that looks safe to users, but will actually attach files when     clicked. (CVE-2022-4055)

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

The version of xdg-utils installed on the remote Azure Linux 3.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2022-4055 advisory.

  - When xdg-mail is configured to use thunderbird for mailto URLs, improper parsing of the URL can lead to     additional headers being passed to thunderbird that should not be included per RFC 2368. An attacker can     use this method to create a mailto URL that looks safe to users, but will actually attach files when     clicked. (CVE-2022-4055)

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

The remote MiracleLinux 9 host has a package installed that is affected by a vulnerability as referenced in the AXSA:2025-10482:01 advisory.

    * xdg-utils: improper parse of mailto URIs allows bypass of Thunderbird security mechanism for attachments     (CVE-2022-4055)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 RockyLinux 9 host has a package installed that is affected by a vulnerability as referenced in the RLSA-2025:7672 advisory.

    * xdg-utils: improper parse of mailto URIs allows bypass of Thunderbird security mechanism for attachments     (CVE-2022-4055)

Tenable has extracted the preceding description block directly from the RockyLinux 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 NewStart CGSL host, running version MAIN 7.02, has xdg-utils packages installed that are affected by a vulnerability:

  - When xdg-mail is configured to use thunderbird for mailto URLs, improper parsing of the URL can lead to     additional headers being passed to thunderbird that should not be included per RFC 2368. An attacker can     use this method to create a mailto URL that looks safe to users, but will actually attach files when     clicked. (CVE-2022-4055)

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

The remote AlmaLinux 9 host has a package installed that is affected by a vulnerability as referenced in the ALSA-2025:7672 advisory.

    * xdg-utils: improper parse of mailto URIs allows bypass of Thunderbird security mechanism for attachments     (CVE-2022-4055)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 Oracle Linux 9 host has a package installed that is affected by a vulnerability as referenced in the ELSA-2025-7672 advisory.

    - Update documentation for CVE-2022-4055 (RHEL-87487)

Tenable has extracted the preceding description block directly from the Oracle Linux 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 Redhat Enterprise Linux 9 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2025:7672 advisory.

    The xdg-utils package is a set of simple scripts that provide basic desktop integration functions for any     Free Desktop.

    Security Fix(es):

    * xdg-utils: improper parse of mailto URIs allows bypass of Thunderbird security mechanism for attachments     (CVE-2022-4055)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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.

  - When xdg-mail is configured to use thunderbird for mailto URLs, improper parsing of the URL can lead to     additional headers being passed to thunderbird that should not be included per RFC 2368. An attacker can     use this method to create a mailto URL that looks safe to users, but will actually attach files when     clicked. (CVE-2022-4055)

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

The version of xdg-utils installed on the remote host is prior to 1.1.0-0.17.20120809git. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2023-2002 advisory.

    A flaw was found in the xdg-email component of xdg-utils-1.1.0-rc1 and newer. When handling mailto: URIs,     xdg-email allows attachments to be discreetly added via the URI when being passed to Thunderbird. An     attacker could potentially send a victim a URI that automatically attaches a sensitive file to a new     email. If a victim user does not notice that an attachment was added and sends the email, this could     result in sensitive information disclosure. It has been confirmed that the code behind this issue is in     xdg-email and not in Thunderbird. (CVE-2020-27748)

    When xdg-mail is configured to use thunderbird for mailto URLs, improper parsing of the URL can lead to     additional headers being passed to thunderbird that should not be included per RFC 2368. An attacker can     use this method to create a mailto URL that looks safe to users, but will actually attach files when     clicked. (CVE-2022-4055)

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

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

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2023-007 advisory.

    A flaw was found in the xdg-email component of xdg-utils-1.1.0-rc1 and newer. When handling mailto: URIs,     xdg-email allows attachments to be discreetly added via the URI when being passed to Thunderbird. An     attacker could potentially send a victim a URI that automatically attaches a sensitive file to a new     email. If a victim user does not notice that an attachment was added and sends the email, this could     result in sensitive information disclosure. It has been confirmed that the code behind this issue is in     xdg-email and not in Thunderbird. (CVE-2020-27748)

    When xdg-mail is configured to use thunderbird for mailto URLs, improper parsing of the URL can lead to     additional headers being passed to thunderbird that should not be included per RFC 2368. An attacker can     use this method to create a mailto URL that looks safe to users, but will actually attach files when     clicked. (CVE-2022-4055)

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

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

ID	Name	Product	Family	Type	Severity
461854	Echo: xdg-utils: security update to 1.2.1-2+e1	Tenable Cloud Security	Echo Local Security Checks	Local	high
461854	Echo: xdg-utils: security update to 1.2.1-2+e1	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
354556	Rocky Linux 9 [CIQ] Security Update: xdg-utils (crlsa-2025_7672)	Nessus	Rocky Linux Local Security Checks	Local	high
351805	AlmaLinux 9.2 [TuxCare] Security Update: xdg-utils Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2025:1751913634)	Nessus	Alma Linux Local Security Checks	Local	high
295858	Azure Linux 3.0 Security Update: xdg-utils (CVE-2022-4055)	Nessus	Azure Linux Local Security Checks	Local	high
283162	MiracleLinux 9 : xdg-utils-1.1.3-13.el9_6 (AXSA:2025-10482:01)	Nessus	Miracle Linux Local Security Checks	Local	high
266554	RockyLinux 9 : xdg-utils (RLSA-2025:7672)	Nessus	Rocky Linux Local Security Checks	Local	high
242709	NewStart CGSL MAIN 7.02 : xdg-utils Vulnerability (NS-SA-2025-0195)	Nessus	NewStart CGSL Local Security Checks	Local	high
241263	AlmaLinux 9 : xdg-utils (ALSA-2025:7672)	Nessus	Alma Linux Local Security Checks	Local	high
237130	Oracle Linux 9 : xdg-utils (ELSA-2025-7672)	Nessus	Oracle Linux Local Security Checks	Local	high
236806	RHEL 9 : xdg-utils (RHSA-2025:7672)	Nessus	Red Hat Local Security Checks	Local	high
225021	Linux Distros Unpatched Vulnerability : CVE-2022-4055	Nessus	Misc.	Local	high
173234	Amazon Linux 2 : xdg-utils (ALAS-2023-2002)	Nessus	Amazon Linux Local Security Checks	Local	high
173127	Amazon Linux 2023 : xdg-utils (ALAS2023-2023-007)	Nessus	Amazon Linux Local Security Checks	Local	high

Detections

Analytics

CVE-2022-4055

high

Tenable Plugins

high

high

high

high

high

high

high

high

high

high

high

high

high

high