U.S. CISA adds Google Chromium CSS, Microsoft Windows, TeamT5 ThreatSonar Anti-Ransomware, and Zimbra flaws to its Known Exploited Vulnerabilities catalog

CVE-2008-0015 is a remote code execution vulnerability in the Microsoft Windows Video ActiveX Control, a browser-hostable component bundled with Windows. It is triggered when a user views a specially crafted web page that instantiates the vulnerable control, which lets the attacker's code run in the context of the logged-on user. A successful attacker gains the same user rights as the victim, so an administrator browsing with elevated rights would face full system compromise; any Windows user who views web content with the control enabled is affected. Per CISA the flaw is being actively exploited (added to the Known Exploited Vulnerabilities catalog on 2026-02-17, ransomware use unknown), and EPSS assigns it a 76.7% probability of exploitation within 30 days, placing it in the top percentile.

Do: Apply Microsoft's security update for the Windows Video ActiveX Control; as interim mitigation, apply the vendor-documented kill-bit registry keys (including the out-of-band 'Isolated' kill bit Microsoft shipped) so the control cannot be instantiated in Internet Explorer. Because the flaw is on the CISA KEV list, federal agencies must remediate within BOD 22-01 timelines (or apply vendor mitigations for cloud services), and defenders should audit legacy Windows hosts for use of this control, discourage browsing with administrator rights, and prioritize patching systems used for web browsing.

CVE-2020-7796 is a server-side request forgery (SSRF, CWE-918) in Synacor Zimbra Collaboration Suite (ZCS) versions before 8.8.15 Patch 7, rated critical at CVSS 9.8 with network reachability and no authentication or privileges required. The flaw is triggered when the WebEx zimlet is installed and zimlet JSP processing is enabled, allowing an unauthenticated remote attacker to make the Zimbra server issue attacker-controlled requests. Successful SSRF can let the attacker reach internal network services from the mail server's position (e.g., internal admin interfaces or other hosts behind the firewall), potentially leading to information disclosure or further compromise, and the CVSS vector indicates high impact to confidentiality, integrity, and availability. Any organization running a vulnerable Zimbra version with the WebEx zimlet present is affected. The flaw was added to CISA's Known Exploited Vulnerabilities catalog on 2026-02-17, confirming active exploitation, and it carries a very high EPSS score (84.4%, top percentile) amid a reported coordinated surge in SSRF exploitation activity.

Do: Upgrade Zimbra Collaboration Suite to 8.8.15 Patch 7 or later. If patching must be delayed, remove or disable the WebEx zimlet and disable zimlet JSP processing to eliminate the trigger; first check whether the WebEx zimlet is installed, since instances without it are not exposed to this specific flaw. As a KEV entry, federal agencies must apply vendor mitigations per BOD 22-01 (or discontinue use if unavailable), and all operators should review Zimbra logs for unauthenticated requests reaching zimlet JSP endpoints.

TeamT5 ThreatSonar Anti-Ransomware fails to properly validate the content of uploaded files, allowing unrestricted upload of dangerous file types (CWE-434). The flaw is triggered by a remote attacker who already holds administrator privileges on the ThreatSonar platform; after authenticating as an admin, the attacker uploads a malicious file that is used to execute arbitrary system commands on the underlying server. Successful exploitation results in full compromise of the host running the product, with high impact on confidentiality, integrity, and availability (CVSS 3.1 score 7.2). All deployments of TeamT5 ThreatSonar Anti-Ransomware are affected per CISA; the available data does not specify affected or fixed version ranges. CISA added the vulnerability to the Known Exploited Vulnerabilities catalog on 2026-02-17 following evidence of active exploitation, though no public proof-of-concept is known and ransomware use is unconfirmed.

Do: Apply mitigations per TeamT5's vendor instructions, following CISA BOD 22-01 timelines for federal agencies, or discontinue use of the product if mitigations are unavailable. Restrict and audit administrator accounts on the ThreatSonar platform, review upload activity and system logs for unexpected commands or processes on the host, and verify current mitigation guidance against the latest TeamT5 advisory since specific fixed versions are not listed in this data.

CVE-2026-2441 is a use-after-free (CWE-416) in Google Chromium's CSS handling that a remote attacker can trigger by getting a user's browser to process a crafted HTML page, potentially corrupting the heap. Successful exploitation yields a memory-corruption primitive in the browser; CVSS scoring is not yet available, but Chromium memory-safety flaws of this class can range from crashes to potential code execution depending on how the corruption is leveraged. Anyone running Chromium or a Chromium-based browser — Google Chrome, Microsoft Edge, Opera, and numerous embedded/branded browsers — is potentially affected, making the exposed population effectively all modern browser users. CISA added the flaw to the Known Exploited Vulnerabilities catalog on 2026-02-17, confirming it is being exploited in the wild; EPSS assigns a 22% probability of exploitation within 30 days (98th percentile), no public PoC is known, and any ransomware association is unknown. This lands amid an accelerating series of actively exploited Chrome zero-days in 2026 described in recent reporting, making rapid patching urgent.

Do: Update Chromium and every Chromium-based browser in your estate (Chrome, Edge, Opera, Brave, and embedded browsers) to the latest vendor-stable release — recent reporting places the current patched release at Chrome 153 — and verify installed versions via the browser's About/Settings page. Per CISA's KEV required action, apply mitigations per vendor instructions or follow BOD 22-01 guidance for cloud services, and discontinue use if mitigations are unavailable. Until patched, restrict high-risk users' browsing to trusted sites and monitor vendor advisories for the specific fixed build, since exact version details are not yet published in this data.