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No exploitation reportedFix available

CVE-2026-100828

Mitigation bypass in the Bookmarks & History component

No exploitation reported by the sources we read.

  • Published2026-09-29
  • Fixed in157.0.0 · 153.4.0
  • WeaknessCWE-693

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Mitigation bypass in the Bookmarks & History component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

Timeline

dates in UTC
  1. 2026-09-2913:17CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-100828?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-100828?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Mozilla firefox
BranchAffectedFixed in
157.0≥ 154.0.0, < 157.0.0157.0.0
153.4< 153.4.0153.4.0
Mozilla thunderbird
BranchAffectedFixed in
157.0≥ 154.0, < 157.0157.0
153.4< 153.4.0153.4.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Mozilla firefox to 157.0.0 · 153.4.0

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Published
2026-09-29
Last Modified
2026-10-13
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-100828?

Mitigation bypass in the Bookmarks & History component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

Is CVE-2026-100828 actively exploited?

Active exploitation of CVE-2026-100828 has not been confirmed. Its EPSS score was 0.2% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-100828?

CVE-2026-100828 has a CVSS v3 base score of 9.6 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

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