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Full vulnerability report · 2026
CVE-2026-79255High confidence

Google Chrome: Improper Input Validation

Google · Chrome

3.1LowCVSS 3.1
Recommended action
Scheduled

Low technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Fix not verified
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-79255 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitychromium-browser: Chromium WebRTC: Web origin policy bypass via improper input validation
1 known not affected

The vendor explicitly states that these products are not affected by this CVE.

  • All currently supported Red Hat products
Summary
A flaw was found in WebRTC, a real-time communication component within Chromium. This improper input validation vulnerability allows a remote attacker, who has already compromised the renderer process, to bypass the web origin policy. This bypass can be achieved by tricking the user into visiting a specially crafted HTML page, potentially leading to unauthorized access to sensitive information or actions across different web origins.
Remediation
No remediation text is recorded.
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-65889

No EUVD known-exploited evidence

Improper input validation in WebRTC in Google Chrome prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
3.1 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Low technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Fix not verified
01

What, why and how

Improper input validation in WebRTC in Google Chrome prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)

What

Improper input validation in WebRTC in Google Chrome prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)

Why

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

How

An attacker operating through a network path may attempt exploitation without authentication after a user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Improper input validation in WebRTC in Google Chrome prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)

Why

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

How

An attacker operating through a network path may attempt exploitation without authentication after a user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Improper Input Validation → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
Required interaction required
Attack complexity
High: exploitation depends on specific conditions
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-20 ↗

CWE-20: Improper Input Validation. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SUnchangedScope: The security impact remains within the vulnerable component's authority.CLowConfidentiality impact: A successful attack can cause a limited loss.INoneIntegrity impact: No direct loss is represented by this metric.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-20
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-65889Official EUVD mapping

Improper input validation in WebRTC in Google Chrome prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)

Official EUVD record
BSI · German · WID-SEC-W-2026-3013Google Chrome: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Google Chrome ausnutzen, um beliebigen Programmcode auszuführen, Berechtigungen zu erweitern, Sicherheitsmaßnahmen zu umgehen, sensible Informationen offenzulegen, Spoofing-Angriffe durchzuführen, Daten zu manipulieren oder Denial-of-Service-Zustände zu verursachen.

Official advisory
CERT-FR · French · CERTFR-2026-AVI-1096Multiples vulnérabilités dans Microsoft Edge

août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79245 du 28 août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79246 du 28 août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79247 du 28 août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79248 du 28 août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79249 du 28 août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79250 du 28 août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79251 du 28 août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79252 du 28 août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79253 du 28 août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79255 du 28 août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79257 du 28 août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79258 du 28 août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79259 du 28 août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79260 du 28 août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79261 du 28 août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79262 du 28 août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79263 du 28 août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79264 du 28 août 2026 Bulletin de sécurité Microsoft Edge CVE-2026-79265 du 28 août 2026 Bulletin de sécurité Microsoft

Official advisory
CERT-FR · French · CERTFR-2026-AVI-1081Multiples vulnérabilités dans Google Chrome

d?id=CVE-2026-79246 Référence CVE CVE-2026-79247 https://www.cve.org/CVERecord?id=CVE-2026-79247 Référence CVE CVE-2026-79248 https://www.cve.org/CVERecord?id=CVE-2026-79248 Référence CVE CVE-2026-79249 https://www.cve.org/CVERecord?id=CVE-2026-79249 Référence CVE CVE-2026-79250 https://www.cve.org/CVERecord?id=CVE-2026-79250 Référence CVE CVE-2026-79251 https://www.cve.org/CVERecord?id=CVE-2026-79251 Référence CVE CVE-2026-79252 https://www.cve.org/CVERecord?id=CVE-2026-79252 Référence CVE CVE-2026-79253 https://www.cve.org/CVERecord?id=CVE-2026-79253 Référence CVE CVE-2026-79254 https://www.cve.org/CVERecord?id=CVE-2026-79254 Référence CVE CVE-2026-79255 https://www.cve.org/CVERecord?id=CVE-2026-79255 Référence CVE CVE-2026-79256 https://www.cve.org/CVERecord?id=CVE-2026-79256 Référence CVE CVE-2026-79257 https://www.cve.org/CVERecord?id=CVE-2026-79257 Référence CVE CVE-2026-79258 https://www.cve.org/CVERecord?id=CVE-2026-79258 Référence CVE CVE-2026-79259 https://www.cve.org/CVERecord?id=CVE-2026-79259 Référence CVE CVE-2026-79260 https://www.cve.org/CVERecord?id=CVE-2026-79260 Référence CVE CVE-2026-79261 https://www.cve.org/CVERecord?id=CVE-2026-79261 Référence CVE CVE-2026-79262 https://www.cve.org/CVERecord?id=CVE-2026-79262 Référence CVE CVE-2026-79263 https://www.cve.org/CVERecord?id=

Official advisory
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix not verified
Affected
152.0.7977.65 < 152.0.7977.65
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 25 Aug 2026 · Last source change 27 Aug 2026, 19:38 UTC · CWE-20 · Improper Input Validation

CVE recordCVE.org · 5.2
CVSS sourceCISA ADP
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-26
European sourceENISA EUVD · EUVD-2026-65889
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceCNA
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →
  1. SeveritySeverity changed from Unknown to Low.
    Before
    Unknown
    After
    Low
    CISA ADP ↗
  2. CVSS scoreCVSS score changed from not recorded to 3.1 (CVSS 3.1 · CISA ADP · CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N).
    Before
    not recorded
    After
    3.1 (CVSS 3.1 · CISA ADP · CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N)
    CISA ADP ↗
  3. ENISA EUVD mappingEUVD-2026-65889 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-65889"}
    ENISA EUVD ↗
  4. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2026-65889↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-79255 · cve.blacktree.nl