PT-2026-41915 · Mozilla+1 · Thunderbird+2

Hafiizh · CVE-2026-8961 · Published 2026-05-19 · Updated 2026-07-23

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 151 Firefox ESR versions prior to 140.11 Thunderbird versions prior to 151 Thunderbird versions prior to 140.11

Description A spoofing issue exists within the Form Autofill component.

Recommendations Update to version 151 Update to version 140.11 Update to version 151 Update to version 140.11

Fix

Authentication Bypass by Spoofing

Weakness Enumeration

CWE-290

Related Identifiers

ALSA-2026:21378

ALSA-2026:21380

ALSA-2026:21381

ALSA-2026:21382

ALSA-2026:22325

ALSA-2026:22643

CVE-2026-8961

OESA-2026-2392

OESA-2026-2393

OESA-2026-2394

OESA-2026-2465

OPENSUSE-SU-2026:10813-1

OPENSUSE-SU-2026:10863-1

OPENSUSE-SU-2026:10864-1

OPENSUSE-SU-2026:21168-1

RHSA-2026:26174

RHSA-2026:26268

RHSA-2026:26269

RHSA-2026:26270

RHSA-2026:26491

RHSA-2026:26492

RHSA-2026:26493

RHSA-2026:26521

RHSA-2026:26536

RHSA-2026:26539

RHSA-2026:26551

RHSA-2026:26606

RHSA-2026:26629

RHSA-2026:26630

RHSA-2026:27715

Affected Products

Firefox

Rocky Linux

Thunderbird

References · 197

• https://osv.dev/vulnerability/openSUSE-SU-2026:10863-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-8961 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8388 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-8947 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2026-48 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2026-22325.html · Vendor Advisory
• https://errata.almalinux.org/9/ALSA-2026-21378.html · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-51/#CVE-2026-8961 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-50 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8961 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-8957 · Security Note
• https://osv.dev/vulnerability/ALSA-2026:22643 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2026-21378.html · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8959 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-8956 · Security Note