ONLYOFFICE's ownCloud integration plugin 9.12 has an SSRF flaw (CVE-2026-84282) letting authenticated admins probe internal networks; no patch exists yet.
CERT/CC published VU#943094 for a server-side request forgery in Ascensio System SIA's ONLYOFFICE ownCloud integration plugin version 9.12, tracked as CVE-2026-84282. The /apps/onlyoffice/ajax/settings/address endpoint does not validate the user-supplied document server URL, so an authenticated administrator can make the ownCloud server send arbitrary requests to localhost and internal hosts. Differences in error responses (connection failures vs SSL/TLS errors) let attackers enumerate open and closed TCP ports for internal reconnaissance. The vendor could not be reached, so no official patch is available; CERT recommends disabling the plugin and applying egress filtering until a fix ships.
Threat actors exploited old unpatched ownCloud vulnerabilities to breach the Philippines nuclear agency, stealing reactor databases, personnel records, and credentials.
Attackers used commodity vulnerabilities in ownCloud as their initial access vector to compromise the Philippines nuclear agency. Stolen data reportedly includes reactor databases, personnel records, and credential stores. The flaws had gone unpatched, allowing sustained access to internal systems. The incident underscores continued exploitation of known file-sharing vulnerabilities against critical infrastructure targets.
Suspected Chinese-speaking operator breached Philippine nuclear research and naval supplier systems via ownCloud CVE-2023-49103 and WordPress CVE-2024-28000.
Hunt.io found an exposed staging server containing custom Python scripts, logs, and stolen data documenting intrusions against a Philippine nuclear research body and a marine engineering company serving the Philippine Navy. The actor exploited an ownCloud authentication bypass (CVE-2023-49103) using empty-secret pre-signed WebDAV URLs and a LiteSpeed Cache plugin flaw (CVE-2024-28000) to gain WordPress admin access, also guessing passwords against XML-RPC with rockyou.txt. Roughly 9 GB was referenced as stolen from the nuclear agency, including reactor databases, radiation-safety records, and staff passport data; Simplified Chinese labels suggest a Chinese-speaking operator.
CISA added three actively exploited vulnerabilities to its KEV catalog: CVE-2023-49105 (ownCloud), CVE-2026-53362 (Linux kernel), and CVE-2026-66384 (JFrog Artifactory).
CISA added three new entries to the Known Exploited Vulnerabilities catalog based on evidence of active exploitation: ownCloud improper authentication (CVE-2023-49105), an unspecified Linux kernel vulnerability (CVE-2026-53362), and JFrog Artifactory improper path restriction (CVE-2026-66384). KEV listing confirms these flaws are being exploited in the wild rather than posing theoretical risk. Under BOD 26-04, federal civilian executive branch agencies must prioritize remediation of KEV entries.
Improper Authentication in ownCloud Server Allows Unauthenticated File Access
ownCloud Server versions from 10.6.0 up to (but not including) 10.13.1 accept WebDAV pre-signed URLs even when no signing key is configured for the file owner, an improper authentication flaw (CWE-287). A remote attacker who knows a victim's username can therefore access, modify, or delete that user's files without any credentials, with no privileges or user interaction required (CVSS 9.8). Any organization running a self-hosted ownCloud Server instance in the affected version range is exposed, especially internet-facing deployments. CISA added the flaw to its Known Exploited Vulnerabilities catalog on 2026-08-27, confirming exploitation in the wild, and EPSS assigns a 43.2% probability of exploitation within 30 days (99th percentile). No public proof-of-concept code is known, but recent press reports of attacks against ownCloud (including theft of records at a Philippine research body) indicate active targeting of ownCloud flaws.
· ownCloud Server (owncloud/core) 10.6.0 through all versions before 10.13.1; fixed in 10.13.1 KEVlarge
Out-of-Bounds Write in Linux Kernel IPv6 Stack via UDPv6 MSG_SPLICE_PAGES
CVE-2026-53362 is an out-of-bounds write (CWE-787) in the Linux kernel's IPv6 output path: __ip6_append_data() mis-accounts fraggap bytes on the paged-allocation branch, leaving the new skb's linear area undersized so the copy of carried-over fragment-gap data spills past skb->end into the trailing skb_shared_info. An unprivileged local user can trigger the corruption by sending over a UDPv6 socket using MSG_MORE combined with MSG_SPLICE_PAGES; the bad accounting was introduced by commit 773ba4fe9104 ('ipv6: avoid partial copy for zc') and became triggerable when commit ce650a166335 allowed the MSG_SPLICE_PAGES case to proceed instead of returning -EINVAL. Successful triggering causes kernel memory corruption that, per the high confidentiality/integrity/availability scores, can lead to loss of data confidentiality, integrity and availability — potentially local privilege escalation or a system crash. Any Linux system running a kernel with the affected code is exposed; the source data provides no specific affected version numbers, only the introducing and trigger commits. The flaw was added to CISA's Known Exploited Vulnerabilities catalog on 2026-08-27, indicating known in-the-wild exploitation (ransomware use unknown), with EPSS at 0.5% and no public PoC known.
Unauthenticated phpinfo credential leak in ownCloud graphapi
CVE-2023-49103 is an unauthenticated information disclosure flaw in ownCloud's graphapi app (0.2.x before 0.2.1 and 0.3.x before 0.3.1), which ships a third-party GetPhpInfo.php page that returns the full PHP phpinfo output when its URL is requested. An attacker with no credentials or user interaction simply accesses that URL over the network, and the phpinfo output reveals all of the webserver's environment variables plus other potentially sensitive configuration details. In containerized deployments these environment variables frequently include the ownCloud admin password, mail server credentials, and license key, giving attackers direct credentials for the server; notably, disabling the graphapi app does not remove the exposed file. Affected deployments are ownCloud installations running the vulnerable graphapi versions, especially ownCloud Docker images built after February 2023, while containers built before February 2023 are not vulnerable to the credential disclosure. Exploitation is confirmed in the wild: CISA added it to the Known Exploited Vulnerabilities catalog on 2023-11-30, the EPSS score is 78.4% (top percentile), and public reporting says threat actors have begun exploiting the flaw, though no public PoC is known.
· ownCloud graphapi (graphapi app) 0.2.x before 0.2.1; 0.3.x before 0.3.1 KEVlarge
Authenticated Path Traversal Write in JFrog Artifactory Exploited in the Wild
CVE-2026-66384 is a directory/path-restriction bypass (CWE-22) in JFrog Artifactory in which an authenticated user can write data outside the intended Docker cache path when specific remote-repository conditions are met. The attack is carried out over the network using valid low-privilege credentials and requires no user interaction, but the triggering conditions are specific enough that the CVSS vector rates exploit complexity as high. A successful attacker gains unauthorized modification of files outside the cache directory (integrity impact only per the CVSS vector, with no confidentiality or availability impact scored), potentially tampering with stored content or system files depending on the deployment. Any organization running JFrog Artifactory with Docker remote repositories is potentially affected. The flaw was added to CISA's Known Exploited Vulnerabilities catalog on 2026-08-27, confirming exploitation in the wild; no public proof-of-concept is known and ransomware use is not confirmed.
SSRF in ONLYOFFICE ownCloud Integration plugin 9.12
CVE-2026-84282 is a server-side request forgery (SSRF) in the ONLYOFFICE ownCloud Integration plugin version 9.12, where the /apps/onlyoffice/ajax/settings/address endpoint does not sufficiently validate the user-supplied Document Server URL before the ownCloud server makes outbound connections. To trigger it, an authenticated administrator supplies a manipulated 'document server' parameter, causing the server to send requests to attacker-chosen destinations, including localhost and internal network hosts. An attacker gains internal network reconnaissance and can perform TCP port scanning of the ownCloud host's local network by differentiating server responses. Only ownCloud deployments running this integration plugin are affected, and exploitation requires administrative access, so an attacker would typically need a compromised or untrusted admin account. There is no known public proof-of-concept, the flaw is not in CISA's KEV catalog, and EPSS puts 30-day exploitation probability at 0.2% (6th percentile).
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