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[NEW] [high] TeamViewer: Vulnerability allows bypassing of security measures

highCVE-2026-12703
A remote, authenticated attacker can exploit a vulnerability in TeamViewer to bypass security measures.

CSIRTS triage

vendor: TeamViewerproduct: TeamViewerAuthentication bypass
What
A remote, authenticated attacker can exploit a vulnerability to bypass security measures.
Who is affected
Users of TeamViewer are affected.
Urgency
Remediation is urgent due to high severity and potential for exploitation.
Action
Update TeamViewer to the latest version to mitigate the vulnerability.

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

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Details

Source
CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity
high
Published
2026-07-30
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-2026-2563

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-12703coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for TeamViewer

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.

More from CERT-Bund (BSI) Security Advisories