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Vulnerability IntelligenceCVE-2026-0887

CVE-2026-0887

MEDIUM4.3

Clickjacking issue, information disclosure in the PDF Viewer component

Published Jan 13, 2026

Modified 4 days ago

Fix available

Details

Clickjacking issue, information disclosure in the PDF Viewer component. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

Affected Packages

Firefox

Ubuntu 14.04 LTSUbuntu 16.04 LTSUbuntu 18.04 LTSUbuntu 20.04 LTSUbuntu 22.04 LTS

Fixed in:

147

Mozilla Firefox

Windows 10 (1507)Windows 10 (1607) / Server 2016Windows 10 (1809) / Server 2019Windows 10 (1903)Windows 10 (1909)

Fixed in:

147

Mozilla Firefox ESR

Windows 10 (1507)Windows 10 (1607) / Server 2016Windows 10 (1809) / Server 2019Windows 10 (1903)Windows 10 (1909)

Fixed in:

140.7

Firefox ESR

macOS 14macOS 15macOS 26

Fixed in:

140.7

References

WEBhttps://bugzilla.mozilla.org/show_bug.cgi?id=2006500 ADVISORYhttps://www.cve.org/CVERecord?id=CVE-2026-0887 WEBhttps://www.mozilla.org/security/advisories/mfsa2026-01/WEBhttps://www.mozilla.org/security/advisories/mfsa2026-03/WEBhttps://www.mozilla.org/security/advisories/mfsa2026-04/WEBhttps://www.mozilla.org/security/advisories/mfsa2026-05/

CVSS Analysis

CVSS v3.1

4.3

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

RequiredUI:R

Scope

UnchangedS:U

Impact

Confidentiality

LowC:L

Integrity

NoneI:N

Availability

NoneA:N

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

Ecosystems(28)

Ubuntu 14.04 LTS Ubuntu 16.04 LTS Ubuntu 18.04 LTS Ubuntu 20.04 LTS Ubuntu 22.04 LTS

Timeline

PublishedJan 13, 2026

ModifiedJan 15, 2026

CVE-2026-0887 | Mondoo Vulnerability Intelligence