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CVE Record

CVE-2026-2768: Sandbox escape in the Storage: IndexedDB component

Sandbox escape in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

CriticalCVSS 10Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

CVE-2026-2768 is a critical Mozilla sandbox escape in the Storage: IndexedDB component. Mozilla says it was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8. A sandbox escape can turn a contained browser or mail-client flaw into broader compromise risk.

Executive priority

Patch as an urgent endpoint and email-client security update. The available evidence supports critical severity, but not confirmed active exploitation. Leadership should prioritize rapid coverage reporting across managed endpoints and Linux package fleets.

Technical view

The record describes a sandbox escape with CVSS 3.1 score 10.0: network reachable, low complexity, no privileges, no user interaction, changed scope, and high confidentiality, integrity, and availability impact. CWE mappings are CWE-284 and CWE-693. Public sources provided do not include root-cause details or exploit procedure.

Likely exposure

Organizations with Firefox, Firefox ESR, Thunderbird, or downstream Red Hat Mozilla packages below the fixed vendor versions may be exposed. Exact vulnerable version ranges are not fully defined in the provided bundle, so asset teams should verify against Mozilla and Red Hat advisories.

Exploitation context

The provided bundle marks KEV as false and does not cite active exploitation. Risk remains high because the CVSS vector indicates remote, unauthenticated, no-user-interaction exploitation potential and full impact if exploitable in a real deployment.

Researcher notes

Public details are limited. The advisory names Storage: IndexedDB and sandbox escape, but the provided sources do not disclose exploit mechanics. Focus validation on version/package state and vendor errata correlation rather than attempting exploit reproduction.

Mitigation direction

  • Upgrade Firefox to 148 or Firefox ESR 140.8 where applicable.
  • Upgrade Thunderbird to 148 or 140.8 where applicable.
  • Apply relevant Red Hat security errata for Mozilla packages.
  • Prioritize managed endpoint, VDI, and server package repositories.
  • Monitor Mozilla and Red Hat guidance for revised affected-version details.

Validation and detection

  • Inventory installed Firefox, Firefox ESR, and Thunderbird versions.
  • Confirm installed builds are fixed vendor versions or patched downstream builds.
  • Check Red Hat CSAF/VEX and RHSA applicability to deployed OS streams.
  • Verify vulnerability scanners map this CVE to Mozilla and Red Hat package names.
  • Document any unsupported systems requiring compensating controls or removal.
Prepared
Confidence
medium
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-284: Authorization and privilege behavior lookup

Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cwe · low confidence lookup

CWE-693: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
description · low confidence lookup

Privilege behavior lookup

The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-2768 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Critical
CVSS
10 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
2ADP providers
34Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
10CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H3.96CISA-ADP
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H1.65.9redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

10Critical
CVSS 3.1 vector shape for CVE-2026-2768Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc
redhat-SADPfirefox: thunderbird: Sandbox escape in the Storage: IndexedDB component
other:Red Hat severity ratingcvssV3_1
  • 2026-02-24T14:02:52.794Z: Reported to Red Hat.
  • 2026-02-24T13:33:06.258Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
MozillaFirefox140.8, 148Listed
MozillaThunderbird140.8, 148Listed
Weakness

CWE details

CWE-284CWE-693

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.