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CVE.org (no NVD analysis yet)· CNA mozilla

CVE-2026-109737: Mitigation bypass in the Enterprise Policies component

HighCVSS 8.1 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 32/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.34% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: firefox-esr (Debian:12) 153.5.0esr-1~deb12u1; thunderbird (Debian:12) 1:153.5.1esr-1~deb12u1; firefox-esr (Debian:13) 153.5.0esr-1~deb13u1.

Low priority for now. Upgrade to firefox-esr (Debian:12) 153.5.0esr-1~deb12u1; thunderbird (Debian:12) 1:153.5.1esr-1~deb12u1; firefox-esr (Debian:13) 153.5.0esr-1~deb13u1 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

Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

Published
Oct 13, 2026
Updated
Oct 19, 2026
EPSS
0.3% · 27th percentile

Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
32 / 40 · 8.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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

Follow CVE-2026-109737

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.

—

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

    • 153.5 and later · up to and including 153.*not affected · rpm
    • 158 and laternot affected · rpm

  • Mozilla Thunderbird

    • 153.5 and later · up to and including 153.*not affected · rpm
    • 158 and laternot affected · rpm

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12firefox-esrbefore 153.5.0esr-1~deb12u1153.5.0esr-1~deb12u1
Debian:12thunderbirdbefore 1:153.5.1esr-1~deb12u11:153.5.1esr-1~deb12u1
Debian:13firefox-esrbefore 153.5.0esr-1~deb13u1153.5.0esr-1~deb13u1
Debian:13thunderbirdbefore 1:153.5.1esr-1~deb13u11:153.5.1esr-1~deb13u1
Debian:14firefox-esrbefore 153.5.0esr-1153.5.0esr-1
Debian:14thunderbirdbefore 1:153.5.0esr-11:153.5.0esr-1

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…KEV
    94Now
  • CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the…KEV
    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…KEV
    86Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-109735Oct 13, 2026 · Use-after-free in the DOM: Animation component
    21Monitor
  • ← EarlierCVE-2026-109736Oct 13, 2026 · Frame poisoning in the Layout component
    32Monitor
  • Later →CVE-2026-109738Oct 13, 2026 · Use-after-free in the Audio/Video: Playback component
    21Monitor

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
debian:firefox-esr153.5.0esr-1~deb12u1 · Debian:12Package registry (OSV)
debian:firefox-esr153.5.0esr-1~deb13u1 · Debian:13Package registry (OSV)
debian:thunderbird1:153.5.0esr-1 · Debian:14Package registry (OSV)
debian:thunderbird1:153.5.1esr-1~deb12u1 · Debian:12Package registry (OSV)
debian:thunderbird1:153.5.1esr-1~deb13u1 · Debian:13Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

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. Fix recorded+2 d
  3. TodayNov 12, 2026+30 d
EPSS, last 120 days

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

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-2026-7587456 days apartSandbox escape in the Remote Settings Client component
    40Plan
  • CVE-2026-2761231 days apartSandbox escape in the Graphics: WebRender component
    40Plan
  • CVE-2026-1097800 days apartMitigation bypass in the DOM: Core & HTML component
    39Monitor
  • CVE-2026-1060167 days apartMitigation bypass in the File Handling component
    39Monitor
  • CVE-2026-9206628 days apartSandbox escape in the Profile Backup component
    39Monitor
  • CVE-2026-1637784 days apartMitigation bypass in the PDF Viewer component
    39Monitor

Not on record for this CVE: patch commit or PR link · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-693 · Protection Mechanism Failure

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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. CVSS— → 8.1
  2. Severity— → high
  3. SSVC exploitation— → none
  4. Fix✗ → ✓
  5. Exploit maturity— → none

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