This vulnerability allows remote attackers to execute arbitrary code on affected installations of Adobe Acrobat Pro DC. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The ZDI has assigned a CVSS rating of 7.8. The following CVEs are assigned: CVE-2026-81989. Weiterlesen
Intelligence View
ZDI-26-663: Adobe Acrobat Pro DC Annotation Use-After-Free Remote Code Execution Vulnerability
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Adobe Acrobat Pro DC. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a…
SOC Incident Playbook: Remote Code Execution (RCE) Defense
title: Detect Exploitation - ZDI-26-663: Adobe Acrobat Pro DC Annotation Use-After-Free Remote Code Execution Vulnerability
id: 20dddfcf-8d9f-4392-ac73-0edbb8663628
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
- https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-25
logsource:
category: network_connection
product: any
detection:
selection:
CommandLine|contains:
- 'exploit'
condition: selection
falsepositives:
- Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
- attack.initial_access
- attack.t1190rule CTI_Threat_Indicator {
meta:
author = "iShareStuff CTI Automated Detection Engine"
date = "2026-09-25"
description = "YARA Signature for "
strings:
$str = "ZDI-26-663: Adobe Acrobat Pro " ascii wide
condition:
any of them
}index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("ZDI-26-663 Adobe Acrobat Pro DC Annotati")
| stats count earliest(_time) as first_seen latest(_time) as last_seen by src_ip, dest_ip, dest_host, signature
| eval first_seen=strftime(first_seen, "%Y-%m-%d %H:%M:%S"), last_seen=strftime(last_seen, "%Y-%m-%d %H:%M:%S")
| sort - countmessage: "*ZDI-26-663 Adobe Acrobat Pro DC Annotati*"CommonSecurityLog
| where Message has "ZDI-26-663 Adobe Acrobat Pro DC Annotati"
| summarize EventCount = count(), FirstSeen = min(TimeGenerated), LastSeen = max(TimeGenerated) by SourceIP, DestinationIP, DestinationPort, Activity
| extend DetectionRule = "iShareStuff-CTI-Compiled"
| sort by EventCount descMITRE ATT&CK Matrix Navigator 14 Taktiken
Supply-Chain Blast Radius & Dependency Topology CVE-2026-81989
EU NIS2 / ISO 27001 Remediation SLA Tracker CVE-2026-81989
Upstream Security Patch & Git Diff CVE-2026-81989
Zero-Trust Micro-Segmentation & Quarantine CVE-2026-81989
#!/usr/sbin/nft -f
# ISS-ZeroTrust Quarantine Policy for CVE-2026-81989
table inet iss_quarantine {
chain inbound_lockdown {
type filter hook input priority -10; policy drop;
# Allow established connections & loopback
ct state established,related accept
iif "lo" accept
# Whitelist SOC / Bastion Management Subnet
ip saddr 10.0.0.0/8 accept
ip saddr 192.168.1.0/24 accept
# Explicitly log & drop vulnerable service traffic
tcp dport 443 log prefix "[ISS-QUARANTINE-CVE-2026-81989] " drop
}
}apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: quarantine-CVE-2026-81989
namespace: production
labels:
security.isharestuff.com/quarantine: "true"
cve.mitigation/id: "CVE-2026-81989"
spec:
podSelector:
matchLabels:
app.kubernetes.io/vulnerable-cve: "CVE-2026-81989"
policyTypes:
- Ingress
- Egress
ingress:
# Restrict ingress solely to authorized security scanners & bastion pods
- from:
- namespaceSelector:
matchLabels:
kubernetes.io/metadata.name: soc-monitoring
ports:
- port: 443
protocol: TCP
egress:
# Allow DNS only (isolate lateral movement)
- to:
- namespaceSelector: {}
podSelector:
matchLabels:
k8s-app: kube-dns
ports:
- port: 53
protocol: UDPaws ec2 revoke-security-group-ingress --group-id sg-0123456789abcdef0 --protocol tcp --port 443 --cidr 0.0.0.0/0
(http.request.uri.path contains "CVE-2026-81989" or http.request.body.mime contains "exploit" or cf.threat_score gt 20)
Operative Incident Triage Checklist
Echtzeit-Expositionsrechner & NIS-2 Risiko
Mittleres Schadenspotential. Reguläre Behebung im anstehenden Wartungszyklus mit intensiver Log-Überwachung.
Mobile Terminal Incident Commands
sudo nft add rule inet filter input ct state new tcp dport { 80, 443, 8080, 8443, 3000 } drop comment "EMERGENCY_QUARANTINE_CVE-2026-81989"
curl -fsSL "https://tsecurity.de/api/v1/patch_diff.php?cve=CVE-2026-81989" | git apply --check -v && curl -fsSL "https://tsecurity.de/api/v1/patch_diff.php?cve=CVE-2026-81989" | git apply -v
sudo grep -E -i "(eval\(|base64_decode|\.\./|/etc/passwd|/bin/sh|cmd\.exe)" /var/log/{nginx,apache2,httpd,syslog}* 2>/dev/null | tail -n 50
kubectl label pods -A -l app.kubernetes.io/name=acrobat quarantine=isolated --overwrite
Angriffsvektor & Schutzschichten-Matrix
Perimeter- und WAF-Schichten bieten ausreichende Vorfilterung. Micro-Segmentierung verhindert Lateral Movement.
Hersteller-Sicherheitsmeldungen & Patch-Status
Hersteller-Advisory noch nicht formal hinterlegt. Regelmäßiges Re-Scanning der CTI-Quellen anberaumt.
-
Web Referencehelpx.adobe.com
tsecurity.de Cognitive Threat RAG
Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich ZDI-26-663: Adobe Acrobat Pro DC Annotat.... Basierend auf 368k Vektor-Korrelationen werden sofortige Isolationsmaßnahmen für betroffene Endpunkte empfohlen.
Netzwerk/Remote-Zugriff ohne Vorauthentifizierung möglich.
- 1. Perimeter-Inspektion: Relevante Portfreigaben und exponierte Endpunkte unverzüglich scannen.
- 2. Patch-Applikation: Hersteller-Hotfix einspielen oder betroffene Daemons in isolierte DMZ-Segmente überführen.
- 3. Telemetrie & EDR-Alerts: Prozessaufrufe und Child-Processes auf anomale Shell-Spawns überwachen.
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