CVE-2026-100822
Spoofing issue in the Networking: HTTP component
MEDIUM
5.4
CVSS Score
Published: September 29, 2026 at 12:36 PM UTC
Updated: October 13, 2026 at 04:13 PM UTC
2 products affected across 1 vendorFirefoxThunderbird
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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.3%
SSVC
No known exploit
Description
Spoofing issue in the Networking: HTTP component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 153.4.0154.0.0 ≤ v < 157.0.0
Vendor states this is fixed in 153.4 (unaffected)
Vendor states this is fixed in 157 (unaffected)
v < 153.4.0154.0 ≤ v < 157.0
Vendor states this is fixed in 153.4 (unaffected)
Vendor states this is fixed in 157 (unaffected)
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (5)
SSVC — Action Prioritization
SSVCNo known exploitNot automatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
5.4MEDIUMCISA-ADP
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- REQUIRED
- Scope
- UNCHANGED
- Confidentiality
- LOW
- Integrity
- NONE
- Availability
- LOW
Vector?
Quick Info
StatusANALYZED
CWE
CWE-451
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