CISA Adds Three Known Exploited Vulnerabilities to Catalog
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
CISA has added three new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. CVE-2023-49105 ownCloud Improper Authentication Vulnerability CVE-2026-53362 Linux Kernel Unspecified Vulnerability CVE-2026-66384 JFrog Artifactory Improper Limitation of a Pathname to a Restricted Directory Vulnerability These types of vulnerabilities are a frequent attack vector for malicious cyber actors and pose significant risks to the federal enterprise. Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CISA’s KEV Catalog on publicly exposed assets that grant total control of the asset post-exploitation, while deferring action for lower-risk vulnerabilities. BOD 26-04 further establishes basic expectations for when agencies must check whether threat actors compromised the system before the patch was applied. While BOD 26-04 applies only to FCEB agencies, CISA encourages all organizations to adopt risk-based vulnerability management and prioritize remediation of KEV Catalog vulnerabilities . CISA will continue to add vulnerabilities to the catalog that meet the specified criteria . Aware of an exploited vulnerability not currently listed in the KEV Catalog? Submit it for potential addition through CISA’s KEV Nomination Form . Potential KEV additions must have a CVE ID, evidence of exploitation, and clear mitigation guidance.
CSIRTS triage
- What
- ownCloud allows attackers to access, modify, or delete files without authentication if the victim username is known and no signing-key is configured.
- Who is affected
- ownCloud deployments where users lack signing-key configuration.
- Urgency
- Critical; actively exploited in the wild and added to CISA's Known Exploited Vulnerabilities catalog.
- Action
- Apply available security patches immediately; configure signing-keys for all user accounts.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://www.cisa.gov/news-events/alerts/2026/08/27/cisa-adds-three-known-exploited-vulnerabilities-catalog
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.
- Exploitation confirmedCVE-2023-49105Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99% of all EPSS-scored CVEs.
- Exploitation confirmedCVE-2026-53362Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 41% of all EPSS-scored CVEs.
- Exploitation confirmedCVE-2026-66384Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 45% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2023-49105 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-53362 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-66384 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- mediumexploited[NEW] [medium] Linux Kernel: Multiple vulnerabilitiescert-bund
- criticalexploited[UPDATE] [critical] ownCloud: Multiple vulnerabilitiescert-bund
- highexploited[NEW] [high] JFrog Artifactory: Multiple vulnerabilitiescert-bund
- criticalexploitedCVE-2023-49105: ownCloud Improper Authentication Vulnerabilitycisa-kev
- criticalexploitedCVE-2026-53362: Linux Kernel Unspecified Vulnerabilitycisa-kev
- criticalexploitedCVE-2026-66384: JFrog Artifactory Improper Limitation of a Pathname to a Restricted Directory Vulnerabilitycisa-kev
- mediumCVE-2026-66384: An authenticated user may write data outside the intended Docker cache path under specific rem…nvd
- unknownMultiple vulnerabilities in Debian LTS Linux kernel (July 31, 2026)cert-fr-avis
- unknownMultiple vulnerabilities in Debian LTS Linux kernel (July 24, 2026)cert-fr-avis
- unknownMultiple vulnerabilities in the SUSE Linux kernel (July 17, 2026)cert-fr-avis
- highexploitedCVE-2026-53362: ipv6: account for fraggap on the paged allocation pathmsrc
- unknownMultiple vulnerabilities in Microsoft Azure Linux (July 09, 2026)cert-fr-avis
Recent advisories for CISA Adds Three
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.
- highexploitedCISA Adds Three Known Exploited Vulnerabilities to Catalogcisa · 2026-08-11
- highexploitedCISA Adds Three Known Exploited Vulnerabilities to Catalogcisa · 2026-08-04
- highexploitedCISA Adds Three Known Exploited Vulnerabilities to Catalogcisa · 2026-07-16
- highexploitedCISA Adds Three Known Exploited Vulnerabilities to Catalogcisa · 2026-07-07
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