This brief covers the trailing ~48 hours (September 12–14, 2026). Every item below was verified against its primary source — vendor advisory, CISA KEV entry, or the original research — with the publish date confirmed on that page. It was a quiet weekend: two developments cleared verification inside the window, followed by several active campaigns from the days just before it.
Cisco Secure Email Gateway SQL injection actively exploited for root, added to CISA KEV
Cisco PSIRT / CISA · September 14, 2026
Cisco published a critical advisory for CVE-2026-76461 (CVSS 9.8, CWE-89), a SQL injection flaw in the email-parsing logic of AsyncOS for Cisco Secure Email Gateway that lets an unauthenticated remote attacker execute arbitrary commands as root simply by sending a crafted email through the appliance. It affects physical and virtual Secure Email Gateway deployments regardless of configuration (Secure Email and Web Manager and Secure Web Appliance are not affected); fixed releases are 15.5.5-0141, 16.0.4-3021 and 16.5.0-780, and there are no workarounds. Cisco confirmed in-the-wild exploitation, has already upgraded all Secure Email Cloud tenants, and has directly contacted cloud customers where indicators of compromise were found. CISA added the CVE to the KEV catalog the same day with a September 17 remediation due date; the advisory includes a mail_logs grep for COPY.*TO PROGRAM as a triage indicator.
“In September 2026, the Cisco PSIRT became aware of active exploitation of this vulnerability.” — Cisco Security Advisory cisco-sa-esa-inj-2bLVGmhX
Source: Cisco advisory · CISA KEV alert
Microsoft ships out-of-band updates after September security patches broke Remote Desktop Services
Microsoft · September 14, 2026
Microsoft released emergency out-of-band cumulative updates to fix Remote Desktop Services (RDS) failures introduced by the September 8 security updates: KB5129237 (Windows Server 2022, OS Build 20348.5631), KB5129235 (Windows Server 2025), KB5129195 (Windows 11 24H2/25H2, builds 26100.9457 and 26200.9457), KB5129194 (Windows 11 26H1) and KB5129236 (Windows 10 21H2/22H2). The server packages are available via the Microsoft Update Catalog only. The regression matters from a security standpoint because many admins had been rolling back KB5122882 / KB5122871 to restore RDP, which also removed that month’s security fixes, including the two exploited zero-days (CVE-2026-81963 and CVE-2026-85880). The OOB updates also fix a Hyper-V/Plan9 shared-folder issue and a multichannel USB audio problem; a separate USB Audio Class 1.0 “Code 10” failure remains unresolved.
“In affected environments, RDS might become unstable, causing RDP connection and sign-in failures or servers to become unresponsive during Remote Desktop configuration.” — Microsoft, KB5129237 release notes
Source: Microsoft KB5129237 · Microsoft KB5129195 · BleepingComputer
Still developing
GitLab CVSS 10 file read, ScreenConnect and chained Artifactory flaws land in KEV
CISA · September 11, 2026
CISA added four vulnerabilities to KEV on September 11: CVE-2026-85706 (GitLab CE/EE path traversal in the repository commits API, CVSS 10.0, unauthenticated arbitrary file read; fixed in 19.1.8, 19.2.6 and 19.3.2, with watchTowr observing in-the-wild probes within hours of disclosure), CVE-2026-84869 (ConnectWise ScreenConnect improper privilege management / missing authorization, CVSS 9.9, allowing file transfer and execution through active remote sessions without host confirmation), and CVE-2026-42016 / CVE-2026-42018 (JFrog Artifactory, CVSS 8.1 and 7.5). Wiz reports the two Artifactory bugs were chained between August 15 and September 8 to mint admin-scoped tokens on self-hosted instances, install malicious Groovy plugins and drop a Rust backdoor. Federal due dates: September 14 for GitLab and ScreenConnect, September 25 for Artifactory.
“Between August 15 and September 8, 2026, we observed multiple actors chain CVE-2026-42018 and CVE-2026-42016 against self-hosted Artifactory instances.” — Wiz Research
Source: CISA KEV catalog · GitLab 19.3.2 patch release · ConnectWise bulletin · BleepingComputer
Check Point VPN: two CVSS 9.8 pre-auth RCEs, Dutch NCSC expects large-scale exploitation
Check Point / NCSC-NL · September 9–10, 2026
CVE-2026-85102 (improper certificate validation during VPN negotiation, sk1000117) and CVE-2026-85103 (heap overflow in the VPN certificate ASN.1 decoder, sk1000118), both CVSS 9.8, allow unauthenticated remote code execution on Quantum Security Gateways, with the second also reaching Security Management Servers. Affected lines include R81.20, R82, R82.10, R81.10.x and R82.00.x plus end-of-support R80.x/R81; R82.20 is not affected. Fixes ship via LivePatch Take 24 and Jumbo Hotfix Accumulator Takes 44/126/166. Check Point reported no evidence of exploitation at disclosure; the Dutch NCSC issued an alert the next day rating the likelihood of exploitation as high. Neither CVE is in KEV yet.
“The NCSC assesses the likelihood of exploitation and the potential impact as high and expects exploitation attempts to occur soon.” — Nationaal Cyber Security Centrum (translated)
Source: Check Point sk1000117 · Check Point sk1000118 · NCSC-NL alert · BleepingComputer
UNC3569 exploited a one-click RCE in Tencent’s Sogou Input Method to drop GRAYRABBIT
Gen Threat Labs · September 10, 2026
Gen Digital disclosed CVE-2026-51990, a one-click remote code execution chain in Sogou Input Method for Windows (hundreds of millions of installs) that combines unvalidated argument injection in the sgbiz: protocol handler, unrestricted URL navigation in a CEF webview, and a bundled Chromium 80 engine running with the sandbox and same-origin policy disabled. The PRC-nexus group UNC3569 exploited it in the wild using a public exploit for CVE-2021-38003 to deploy the GRAYRABBIT backdoor via DLL sideloading. Tencent patched the protocol handler in version 16.3.0.3498 (April 21, 2026), but the researchers note the embedded browser remains outdated and unsandboxed. No CVSS score has been published by the vendor, and the CVE is not in KEV.
“We observed this vulnerability actively exploited in the wild by the UNC3569 threat group to deploy the GRAYRABBIT backdoor through a crafted link.” — Gen Threat Labs
Source: Gen Threat Labs research · BleepingComputer
Mass scanning of exposed Vite dev servers for AWS, Azure and Terraform secrets
F5 Labs · September 11, 2026
F5 Labs’ honeypots recorded roughly 32,000 events across 807 attack sessions in August exploiting CVE-2026-39364 (CVSS 7.5, CWE-200), a server.fs.deny bypass in the Vite development server’s /@fs/ route that returns restricted files when query strings such as ?raw?? or ?import&raw are appended. Affected versions are Vite 7.1.0 through 7.3.1 and 8.0.0 through 8.0.4 (fixed in 7.3.2 and 8.0.5). The scanner cycled through .env variants, .aws/credentials across user home directories, Azure accessTokens.json, Terraform state and /proc/self/environ, spoofing Googlebot, ClaudeBot and GPTBot user agents from Google Cloud IP space. The CVE is not in KEV, although the related CVE-2025-31125 is.
“The rapid increase from baseline background noise highlights how quickly newly disclosed bypass methods are folded into automated credential-harvesting operations.” — F5 Labs, Sensor Intel Series
Source: F5 Labs research
This brief covers the trailing ~48 hours (September 12–14, 2026).
Primary sources:
- Cisco Security Advisory cisco-sa-esa-inj-2bLVGmhX (CVE-2026-76461)
- CISA: Adds One Known Exploited Vulnerability to Catalog (Sept. 14, 2026)
- Microsoft KB5129237 (Windows Server 2022 out-of-band)
- Microsoft KB5129195 (Windows 11 24H2/25H2 out-of-band)
- CISA Known Exploited Vulnerabilities Catalog
- GitLab Patch Release 19.3.2 (CVE-2026-85706)
- ConnectWise ScreenConnect Security Bulletin (CVE-2026-84869)
- Check Point sk1000117 (CVE-2026-85102)
- Check Point sk1000118 (CVE-2026-85103)
- NCSC-NL alert on Check Point VPN vulnerabilities
- Gen Threat Labs: Gray Rabbits and the Tale of a One-Click Backdoor (CVE-2026-51990)
- F5 Labs: Cloud Takeover — Mass Scanning for Exposed Vite Endpoints (CVE-2026-39364)