CVE-2026-100808
Mitigation bypass in the DOM: Service Workers component
Description
Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
INFO
Published Date :
Sept. 29, 2026, 1:17 p.m.
Last Modified :
Oct. 5, 2026, 2:52 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update Firefox to version 157 or later.
- Update Firefox ESR to version 153.4 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-100808.
| URL | Resource |
|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=2063488 | Permissions Required |
| https://www.mozilla.org/security/advisories/mfsa2026-100/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2026-101/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2026-103/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2026-97/ | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-100808 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-100808
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-100808 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-100808 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Oct. 05, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* versions up to (excluding) 153.4.0 *cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* versions from (including) 154.0.0 up to (excluding) 157.0.0 *cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* versions up to (excluding) 153.4.0 *cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* versions from (including) 154.0 up to (excluding) 157.0 Added Reference Type Mozilla Corporation: https://bugzilla.mozilla.org/show_bug.cgi?id=2063488 Types: Permissions Required Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-100/ Types: Vendor Advisory Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-101/ Types: Vendor Advisory Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-103/ Types: Vendor Advisory Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-97/ Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 01, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Added CWE CWE-693 Added SSVC {'id': 'CVE-2026-100808', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-10-01T15:22:01.814006Z'} -
CVE Modified by [email protected]
Sep. 30, 2026
Action Type Old Value New Value Changed Description Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157. Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157. Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/100xxx/CVE-2026-100808.json">CVE-2026-100808</a> Added Reference https://www.mozilla.org/security/advisories/mfsa2026-101/ Added Reference https://www.mozilla.org/security/advisories/mfsa2026-103/ -
New CVE Received by [email protected]
Sep. 29, 2026
Action Type Old Value New Value Added Description Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/100xxx/CVE-2026-100808.json">CVE-2026-100808</a> Added Reference https://bugzilla.mozilla.org/show_bug.cgi?id=2063488 Added Reference https://www.mozilla.org/security/advisories/mfsa2026-100/ Added Reference https://www.mozilla.org/security/advisories/mfsa2026-97/