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PHP2Shell is the name for CVE-2026-109618 and CVE-2026-109619, two unauthenticated remote code execution flaws in PHP, both CVSS v4.0 9.2. One stems from out-of-memory corruption during request setup, the other from stale global state reused by the next request. watchTowr reports exploitation since 21 October 2026, lists fixed releases (8.5.12, 8.4.27, 8.3.36, 8.2.35) and says PHP 5 is also affected. PHP says no configuration change fully mitigates.
CVE-2026-102764 is an arbitrary file upload in BeyondTrust Remote Support (formerly Bomgar) caused by internal appliance components not validating message origin. Mandiant found it exploited as a zero-day in late August 2026. BeyondTrust disclosed it on 15 October 2026 and CISA added it to KEV on 16 October 2026. The FAQ covers the web shell, root escalation, credential theft, persistence, patching and compromise checks.
CVE-2026-102764 is a CVSS 9.8 unauthenticated arbitrary file upload flaw in BeyondTrust Remote Support (formerly Bomgar) and Privileged Remote Access. Internal messaging components do not verify message origin, so remote attackers can plant files the appliance would reject. BeyondTrust disclosed it on 15 October 2026 with patch BT26-05, and CISA added it to KEV on 16 October 2026. The page lists log files to review and hardening steps.
CVE-2026-104935 is an authentication bypass by spoofing in Ivanti Connect Secure. A remote attacker can forge identity signals and run arbitrary commands without credentials. CISA added it to the KEV catalog on 13 October 2026. The FAQ lists affected branches by ISA hardware (25.1.1.1, 25.1.2.2, 22.8.X), fixed versions (25.1.1.2, 25.1.3.0/25.1.3.1, 22.8R2.5), no workaround and no reliable IOCs.
Ivanti Connect SecureVPN
CVE-2026-104935CISA KEVCISA+1
Threat Intel, Blue Team & Detection· 2026-10-13T16:00:55+00:00
CVE-2026-104935 is an authentication bypass by spoofing in Ivanti Connect Secure (CVSS 3.1 score 8.6) that lets a remote attacker run commands without logging in. CISA added it to KEV on 13 October 2026. The 22.8.X bridge release and 25.1.2.2 and earlier are affected, with fixes in 22.8R2.5, 25.1.1.2, 25.1.3.0 and 25.1.3.1. Ivanti says no reliable indicators of compromise exist yet.
watchTowr post-exploitation analysis of CVE-2026-88771, an unauthenticated log-poisoning command injection in Citrix NetScaler (advisory CTX697096). Sensors logged thousands of attempts: about 85% were OOB callbacks, the rest Sliver implants, a trojanized Dropbear SSH backdoor, a Perl stager with a PHP webshell, and SSH-key and secret-harvesting sprays. Includes artifacts to hunt (/var/tmp files, ns_helper, ns.conf edits) and IOC repo pointers.
Citrix NetScalerSliverSSH+2
CVE-2026-88771CVE-2026-88772CVE-2026-88779+8
Threat Intel, Blue Team & Detection, Malware & RE· 2026-10-07T16:34:58+00:00
CVE-2026-21589 is an unauthenticated arbitrary file read (path traversal) in eight Atlassian Data Center and Server products: Bitbucket, Confluence, Jira, Jira Service Management, Bamboo, Crowd, Crucible and Fisheye. Atlassian fixed it on 5 October 2026, and CISA added it to the KEV catalog on 15 October 2026. The page lists patching, WAF regex, Tomcat RewriteValve and urlrewrite.xml mitigations, and a log check for ".." sequences after up to two rounds of URL decoding.
JiraConfluenceBitbucket+3
CVE-2026-21589CISA KEVpath traversal+3
AppSec, Blue Team & Detection· 2026-10-06T11:41:48+00:00
CVE-2026-21589 is an unauthenticated arbitrary file read in eight self-hosted Atlassian products: Bitbucket, Confluence, Jira Service Management, Jira Software, Bamboo, Crowd, Crucible and Fisheye Data Center. Attackers must know the exact file path, and watchTowr Intel observed exploitation by 6 October 2026. The FAQ covers the timeline (Atlassian advisory 5 October 2026), upgrade and WAF mitigations, and log searches for two dots next to a slash, backslash or double colon.
JiraConfluenceBitbucket+2
CVE-2026-21589path traversalCISA KEV+1
AppSec, Blue Team & Detection· 2026-10-06T10:14:22+00:00
watchtowr.comadvisory
