CVE-2025-48980Network attack vector

Strict-cookie exposure via split-view SameSite bypass

Published Oct 30, 2025 · Updated Oct 30, 2025

SameSite enforcement failure in Brave Browser Desktop before 1.83.10 allows remote attackers to send Strict cookies cross-site. The Open Link in Split View navigation path treated a cross-site link as eligible for existing SameSite=Strict cookies instead of withholding them. Exploitation requires split view to be enabled and a user to invoke the context-menu action; the bounded consequence is unintended authenticated cross-site navigation.

CVSS severity6.5
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SameSite enforcement failure in Brave Browser Desktop before 1.83.10 allows remote attackers to send Strict cookies cross-site. The Open Link in Split View navigation path treated a cross-site link as eligible for existing SameSite=Strict cookies instead of withholding them. Exploitation requires split view to be enabled and a user to invoke the context-menu action; the bounded consequence is unintended authenticated cross-site navigation.

The record

CVE
CVE-2025-48980
Published
Oct 30, 2025
Updated
Oct 30, 2025
Vendor
Brave Software, Inc.
Product
Brave Browser
Classifications
CWE-565, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.83.10 <1.83.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Brave Software, Inc. · Brave Browserversion=1.83.10 <1.83.10

Published CVSS scores

6.5HackerOne CNACVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-565Reliance on Cookies without Validation and Integrity Checking
T1204.001Malicious Link

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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