CVE-2026-0887: Clickjacking issue, information disclosure in the PDF Viewer component
Clickjacking issue, information disclosure in the PDF Viewer component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.
Other sources
Clickjacking issue, information disclosure in the PDF Viewer component. This vulnerability affects Firefox < 147 and Firefox ESR < 140.7.
— Red Hat
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 147 - Upgrade
Upgrade
ubuntu/thunderbirdto a version that resolves this vulnerability.Fixed in 1:140.7.1+build1-0ubuntu0.22.04.1 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 140.7 - Upgrade
Upgrade
debian/firefoxto a version that resolves this vulnerability.Fixed in 160.0-1 - Upgrade
Upgrade
debian/firefox-esrto a version that resolves this vulnerability.Fixed in 140.12.0esr-1~deb12u1Fixed in 153.7.0esr-1~deb12u1Fixed in 140.15.0esr-1~deb13u1Fixed in 153.6.0esr-1~deb13u1Fixed in 153.5.1esr-1Fixed in 153.7.0esr-1 - Upgrade
Upgrade
debian/thunderbirdto a version that resolves this vulnerability.Fixed in 1:140.12.0esr-1~deb12u1Fixed in 1:153.6.0esr-1~deb12u2Fixed in 1:140.12.0esr-1~deb13u1Fixed in 1:153.6.0esr-1~deb13u1Fixed in 1:153.5.0esr-1Fixed in 1:153.7.0esr-1 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 147 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 140.7 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 147 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 140.7
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2026-0887?
CVE-2026-0887 is classified as a moderate severity vulnerability due to its clickjacking and information disclosure implications.
How do I fix CVE-2026-0887?
To fix CVE-2026-0887, update to Firefox version 147 or Firefox ESR version 140.7 or later.
What software is affected by CVE-2026-0887?
CVE-2026-0887 affects Firefox versions prior to 147 and Firefox ESR versions prior to 140.7.
What type of vulnerability is CVE-2026-0887?
CVE-2026-0887 is a clickjacking vulnerability that results in the potential for information disclosure.
Can CVE-2026-0887 be exploited remotely?
Yes, CVE-2026-0887 can be exploited remotely as it allows attackers to deceive users into interacting with malicious content.