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CVE-2026-6765· NVD / CVE Program· CNA mozilla

Information disclosure in the Form Autofill component

Noroxi assessment

Priority: Monitor (action score 21/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.35% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: firefox (AlmaLinux:10) 140.10.0-1.el10_1; thunderbird (AlmaLinux:10) 140.10.0-1.el10_1.alma.1; firefox (AlmaLinux:8) 140.10.0-1.el8_10.alma.1.

Low priority for now. Upgrade to firefox (AlmaLinux:10) 140.10.0-1.el10_1; thunderbird (AlmaLinux:10) 140.10.0-1.el10_1.alma.1; firefox (AlmaLinux:8) 140.10.0-1.el8_10.alma.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Information disclosure in the Form Autofill component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

MediumCVSS 5.3 · v3.1—Proof of concept Fix available
Published
Apr 21, 2026
Updated
Jun 17, 2026
EPSS
0.3% · 27th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-6765

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
mozillafirefox
mozillathunderbird

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mozilla firefoxbefore 140.10.0
  • mozilla firefoxbefore 150.0
  • mozilla thunderbirdbefore 140.10.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mozilla). Independent of NVD's CPE analysis and usually ahead of it.

  • Mozilla Firefox

    • 140.10 and later · up to and including 140.*not affected · rpm
    • 150 and laternot affected · rpm

  • Mozilla Thunderbird

    • 140.10 and later · up to and including 140.*not affected · rpm
    • 150 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10firefoxbefore 140.10.0-1.el10_1140.10.0-1.el10_1
AlmaLinux:10thunderbirdbefore 140.10.0-1.el10_1.alma.1140.10.0-1.el10_1.alma.1
AlmaLinux:8firefoxbefore 140.10.0-1.el8_10.alma.1140.10.0-1.el8_10.alma.1
AlmaLinux:8thunderbirdbefore 140.10.0-1.el8_10.alma.1140.10.0-1.el8_10.alma.1
AlmaLinux:9firefoxbefore 140.10.0-1.el9_7.alma.1140.10.0-1.el9_7.alma.1
AlmaLinux:9firefox-x11before 140.10.0-1.el9_7.alma.1140.10.0-1.el9_7.alma.1
AlmaLinux:9thunderbirdbefore 140.10.1-1.el9_8.alma.1140.10.1-1.el9_8.alma.1
AlmaLinux:9thunderbirdbefore 140.10.0-1.el9_7.alma.1140.10.0-1.el9_7.alma.1
Debian:12firefox-esrbefore 140.10.0esr-1~deb12u1140.10.0esr-1~deb12u1
Debian:12thunderbirdbefore 1:140.10.0esr-1~deb12u11:140.10.0esr-1~deb12u1
Debian:13firefox-esrbefore 140.10.0esr-1~deb13u1140.10.0esr-1~deb13u1
Debian:13thunderbirdbefore 1:140.10.0esr-1~deb13u11:140.10.0esr-1~deb13u1
Debian:14firefox-esrbefore 140.10.0esr-1140.10.0esr-1
Debian:14thunderbirdbefore 1:140.10.0esr-11:140.10.0esr-1
openSUSE:TumbleweedMozillaFirefoxbefore 150.0-1.1150.0-1.1
openSUSE:TumbleweedMozillaThunderbirdbefore 140.9.1-1.1140.9.1-1.1
Red Hat:enterprise_linux_eus:10.0firefoxbefore 0:140.10.0-1.el10_00:140.10.0-1.el10_0
Red Hat:enterprise_linux_eus:10.0firefox-debuginfobefore 0:140.10.0-1.el10_00:140.10.0-1.el10_0
Red Hat:enterprise_linux_eus:10.0firefox-debugsourcebefore 0:140.10.0-1.el10_00:140.10.0-1.el10_0
Red Hat:enterprise_linux_eus:10.0thunderbirdbefore 0:140.10.0-1.el10_00:140.10.0-1.el10_0
Red Hat:enterprise_linux_eus:10.0thunderbird-debuginfobefore 0:140.10.0-1.el10_00:140.10.0-1.el10_0
Red Hat:enterprise_linux_eus:10.0thunderbird-debugsourcebefore 0:140.10.0-1.el10_00:140.10.0-1.el10_0
Red Hat:enterprise_linux:10.1firefoxbefore 0:140.10.0-1.el10_10:140.10.0-1.el10_1
Red Hat:enterprise_linux:10.1firefox-debuginfobefore 0:140.10.0-1.el10_10:140.10.0-1.el10_1

+84

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

  • CVE-2010-3765Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x befKEV
    94Now
  • CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxeKEV
    87Now
  • CVE-2015-4495The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to bypassKEV
    86Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-6763Apr 21, 2026 · Mitigation bypass in the File Handling component
    26Monitor
  • ← EarlierCVE-2026-6764Apr 21, 2026 · Incorrect boundary conditions in the DOM: Device Interfaces component
    26Monitor
  • Later →CVE-2026-6766Apr 21, 2026 · Incorrect boundary conditions in the Libraries component in NSS
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:firefox140.10.0-1.el9_7.alma.1 · AlmaLinux:9Package registry (OSV)
almalinux:firefox-x11140.10.0-1.el9_7.alma.1 · AlmaLinux:9Package registry (OSV)
almalinux:thunderbird140.10.0-1.el10_1.alma.1 · AlmaLinux:10Package registry (OSV)
debian:firefox-esr140.10.0esr-1~deb12u1 · Debian:12Package registry (OSV)
debian:thunderbird1:140.10.0esr-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:MozillaFirefox150.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:MozillaThunderbird140.9.1-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:firefox0:140.10.0-1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:firefox-debuginfo0:140.10.0-1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:firefox-debugsource0:140.10.0-1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:firefox-x110:140.10.0-1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:thunderbird0:140.10.0-1.el10_1 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:thunderbird-debuginfo0:140.10.0-1.el10_1 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:thunderbird-debugsource0:140.10.0-1.el10_1 · Red Hat:enterprise_linux:10.1Package registry (OSV)
rocky linux:firefox0:140.10.0-1.el9_7 · Rocky Linux:9Package registry (OSV)
rocky linux:thunderbird0:140.10.0-1.el10_1 · Rocky Linux:10Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02026-08-25

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+126 d
  3. TodayOct 21, 2026+183 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-74966119 days apartInformation disclosure in the Form Autofill component
    30Monitor
  • CVE-2025-3035385 days apartTab title disclosure across pages when using AI chatbot
    21Monitor
  • CVE-2025-10859203 days apartData stored in cookies for non-HTML content while browsing Incognito could be viewed after closing private tabs
    16Monitor
  • CVE-2025-1939413 days apartTapjacking in Android Custom Tabs using transition animations
    15Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-359 · Exposure of Private Personal Information to an Unauthorized Actor

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records