[UPDATE] [high] WebKitGTK: Multiple vulnerabilities

CSIRTS triage

What

Multiple vulnerabilities in WebKitGTK can be exploited to conduct denial of service attacks, disclose information, and bypass security precautions.

Who is affected

Remote attackers can exploit these vulnerabilities in WebKitGTK deployments.

Urgency

Remediation is urgent due to the high severity and potential for exploitation.

Action

Update to the latest version of WebKitGTK to mitigate these vulnerabilities.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source

CERT-Bund (BSI) Security Advisories (DE · national-cert · site)

Severity

high

Published

2026-09-01

Exploitation

Not in CISA KEV at last sync

Language

Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1766

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

• Low exploitation riskCVE-2026-288470.60% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 47% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-288830.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-289010.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-289020.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-289030.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-289040.41% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-289050.41% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-289070.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 23% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-289420.46% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-289460.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.

Referenced CVEs

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

• high[UPDATE] [hoch] Apple Safari, macOS, iOS und iPadOS: Mehrere Schwachstellencert-bund
• high[UPDATE] [hoch] Apple iOS und iPadOS: Mehrere Schwachstellencert-bund
• unknownUSN-8703-1: WebKitGTK vulnerabilitiesubuntu
• unknownNCSC-2026-0319 [1.00] [M/H] Vulnerabilities resolved in Apple iOS and iPadOSncsc-nl
• unknownApple Products Multiple Vulnerabilitieshkcert
• unknownMultiple vulnerabilities in Apple products (August 18, 2026)cert-fr-avis
• unknownDSA-6398-1 webkit2gtk - security updatedebian

Recent advisories for WebKitGTK

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

• high[UPDATE] [hoch] WebKitGTK: Schwachstelle ermöglicht Codeausführungcert-bund · 2026-09-15
• high[UPDATE] [hoch] WebKitGTK: Schwachstelle ermöglicht Codeausführungcert-bund · 2026-09-15
• high[UPDATE] [hoch] WebKitGTK: Mehrere Schwachstellencert-bund · 2026-09-14
• medium[UPDATE] [mittel] WebKitGTK: Mehrere Schwachstellencert-bund · 2026-09-04
• highexploited[UPDATE] [hoch] WebKitGTK: Mehrere Schwachstellencert-bund · 2026-09-04
• high[UPDATE] [hoch] WebKitGTK: Mehrere Schwachstellencert-bund · 2026-09-04

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