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Cybersecurity topic

Application Security

Security research and incidents involving web applications, APIs, application logic, developer platforms, testing, and internet-facing services. Software distribution and dependency compromises are categorized separately as supply-chain security.

Unauthenticated attackers are bypassing Cisco ISE’s management interface (CVE-2026-76460)

Cisco confirmed active exploitation of CVE-2026-76460, an authentication bypass in an ISE API endpoint that lets a remote unauthenticated attacker bypass the web management interface; the fix requires upgrading to 3.3 Patch 12, 3.4 Patch 7, or 3.5 Patch 4, and no workarounds exist. The Shadowserver Foundation separately observed active exploitation of CVE-2026-89026 in Issabel Framework, where a hard-coded HS256 JWT signing key in pbxapi/index.php lets an unauthenticated attacker forge bearer tokens and execute arbitrary OS commands as the Asterisk user; a patch shipped August 1, 2026, replaces the key with one stored in /etc/issabel.conf.

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Active Exploitation Attempts Target WSO2 API Manager JWT Bypass With Forged Admin Tokens

WatchTowr confirmed active in-the-wild exploitation of CVE-2026-5430 in WSO2 API Manager (CVSS 9.8), capturing forged admin-privilege JWT tokens on its honeypot network on September 13, 2026; vendor fixes ship as pull requests and update levels spanning API Manager 4.1.0 through 4.6.0, API Control Plane, Traffic Manager, and Universal Gateway. Acronis separately reported limited, targeted exploitation of CVE-2026-87886 in its cPanel/WHM backup plugin based on a single customer report, while CISA added CVE-2026-76461, a Cisco Secure Email Gateway SQL injection, to its Known Exploited Vulnerabilities catalog.

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LiteSpeed Enterprise Flaw Could Let One Hosting Account Gain Root Access on a Shared Server

Cisco confirmed active exploitation of CVE-2026-76461, an unauthenticated SQL-injection flaw in Secure Email Gateway's AsyncOS email parsing that yields root command execution; CISA added it to the KEV catalog with a September 17 patch deadline, and Cisco published IoCs directing defenders to inspect cluster mail_logs for suspicious SQL statements. Volexity attributed the BlueMoon Chrome-Windows chain (CVE-2026-85046, -87491, -85880) to two China-linked actors, UTA0560 and APT31, who targeted NGOs on September 1 through a patch gap in which Chromium source carried the fixes before any stable Chrome release shipped them.

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CISA Adds 5 Actively Exploited Artifactory, ScreenConnect, and RouterOS Flaws to KEV

CISA added five actively exploited flaws to its KEV catalog—two JFrog Artifactory authorization bugs chained with CVE-2026-82329 to install Rust backdoors and malicious Groovy plugins on self-hosted servers, a ScreenConnect client flaw (CVE-2026-84869) used to push VBScript payloads to newly connected hosts, and two RouterOS flaws exploited in a chain CERT Polska calls MikroTrick—alongside N-able N-central's CVE-2026-86218, a pre-authentication static code injection (CVSS 10.0) fixed in 2026.3 Hotfix 4 with an FCEB patch deadline of September 11. The F5 BIG-IP APM in-memory web shell (c05d5254), which F5 linked to the reclassified CVE-2025-53521 RCE, is described by Sophos and ESET as designed to survive upgrade images because it hooks Apache's apr_dso_load to inject the shell into the libphp module in memory, evading disk-based integrity checks, and the UK NCSC advises investigating for compromise regardless of when the system was updated.

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GitLab CVSS 10 File-Read Flaw Draws In-the-Wild Probes After Disclosure

CISA added CVE-2026-85706 to its KEV catalog on September 11 after watchTowr observed in-the-wild probes against GitLab's unauthenticated repository-commits API path traversal (CVSS 10.0); self-managed instances should patch to 19.1.8, 19.2.6, or 19.3.2 and review HTTP POST requests to /api/v4/projects/{id}/repository/commits/ URIs containing file.Path parameters. Separately, Wiz confirmed that multiple actors chained CVE-2026-42018 and CVE-2026-42016 against self-hosted JFrog Artifactory between August 15 and September 8 to mint admin tokens, install malicious Groovy plugins, and deploy a Rust-based backdoor, with 49–62% of reachable instances vulnerable to at least one of the three flaws.

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Cisco confirms CVE-2026-20079 Secure FMC flaw exploited in attacks

Cisco confirmed on Wednesday that CVE-2026-20079, a CVSS 10.0 authentication bypass in Secure FMC that lets an unauthenticated remote attacker execute root-level commands via crafted HTTP requests, is under active exploitation, with no workarounds available and CISA ordering federal civilian agencies to patch by September 12. Proofpoint separately documented four espionage clusters deploying the BlueMoon kit—chaining two V8 Chrome flaws with a Windows ALPC heap overflow—within a single week, and CISA has set KEV patch deadlines of September 18 through 23 for the three CVEs while publishing process-tree, file, and scheduled-task IOCs for organizations to hunt after applying browser and OS updates.

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Chrome V8 Zero-Day Exploited in the Wild Enables Code Execution Inside Sandbox

Google shipped fixes for an actively exploited V8 out-of-bounds write (CVE-2026-87491) enabling sandboxed code execution via crafted HTML, and Microsoft's September cumulative update closes two confirmed zero-days—CVE-2026-81963 in the Windows Update Stack and CVE-2026-85880 in Windows ALPC—both granting SYSTEM to low-privilege authenticated users. SAP's newly patched CVSS 10.0 kernel flaw (CVE-2026-44756) permits unauthenticated remote code execution with administrative privileges across web, GUI, and RFC layers, and Onapsis warns that no network control or authorization boundary stops it because the vulnerable deserialization runs before any authentication step.

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Adobe Patches Magento Zero-Day Exploited to Deploy Rust Backdoor and PHP Web Shell

Adobe shipped the VULN-39341 hotfix for CVE-2026-75650 (StyleSmuggler), a template-injection flaw in Magento's payment-reminder pipeline that Sansec confirmed under active exploitation since September 4, with threat actors deploying a Rust-based Linux backdoor and a PHP web shell; Adobe requires both the patch and encryption-key rotation across affected Adobe Commerce and Magento Open Source versions through 2.4.9-2026-aug. In the same window, CERT Polska confirmed active exploitation of the MikroTrick chain (CVE-2026-67276 and CVE-2026-86060) against SSH-enabled MikroTik RouterOS devices, fixed in 6.49.21, 7.23.4, and 7.24.2, while Google patched a V8 type-confusion zero-day (CVE-2026-85046) under active exploitation in Chrome 152.0.7977.82.

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Critical Citrix NetScaler auth bypass now leveraged in attacks

Previdian's NetScaler sensor logged PoC-matched requests against CVE-2026-19490 from three source IPs on September 3, and Arctic Wolf confirmed active exploitation of the PaperCut CVE-2026-81578/CVE-2026-82078 authentication-bypass-to-RCE chain in U.S. and European education institutions, with LSA collection tools and Meterpreter sessions observed on compromised hosts. Wordfence has blocked over 440,000 attempts against the unauthenticated file-upload RCEs in Super Forms (CVE-2026-14894, fixed in 6.3.314) and Elementor Pro (CVE-2026-32475, fixed in 4.2.2), both of which permit PHP web-shell deployment without credentials.

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Attackers Steal METR API Key and Consume AI Credits Worth About $600,000

PaperCut shipped emergency patches for CVE-2026-81578 and CVE-2026-82078 after Defused confirmed active exploitation in which an actor chains the authentication bypass to dump Derby database tables, while Shadowserver tracks over 800 exposed NG and MF servers. VulnCheck logged 360 detections of CVE-2026-0768 and CVE-2026-66066 exploitation against Langflow and Rails hosts, with attackers harvesting API keys and cloud credentials from environment variables, and noted that a patched 8.1.3.1 server still executes the RCE gadget through variation-key Marshal deserialization.

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What vulnerability prioritization looks like when KEV, EPSS, and CVSS disagree

Sygnia confirmed that the Fire Ant actor deployed purpose-built implants on Cisco IOS XR routers and TACACS servers that filter log output, hide GRE tunnel configuration from administrators, and exfiltrate credentials through a tac_plus library-injection technique it tracks as TacTap, with IoCs and YARA rules published for defensive validation. CISA added CVE-2026-60004 (Gitea code injection) and CVE-2026-8452 (Citrix NetScaler) to its KEV catalog, confirming active exploitation of both, while Shadowserver reported at least 274 internet-facing Zimbra instances already compromised via CVE-2026-73570.

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Over 8,300 Gitea servers vulnerable to code execution attacks

Shadowserver confirmed 8,393 internet-exposed Gitea servers remain unpatched against CVE-2026-60004, a diffpatch code-injection flaw now on CISA's KEV list with a three-day federal deadline, and the vulnerability is exploitable without prior credentials because Gitea enables self-registration by default. watchTowr separately confirmed active exploitation of a chained PaperCut NG/MF authentication bypass (CVE-2026-81578) and unsafe dynamic class-loading flaw (CVE-2026-82078) on two customer environments, and identified new bypasses in the second emergency patch that leave the attack chain partially open on the latest release.

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PaperCut Zero-Day Exploited in Attacks, Affecting All NG and MF Versions

PaperCut has confirmed active zero-day exploitation across all NG and MF versions, released emergency patches for v25 and v26, and directed internet-exposed servers to immediately restrict access to trusted IP addresses while its investigation continues. Separately, McKesson disclosed a breach it detected on August 25, while ShinyHunters alleges it used vishing to compromise Okta accounts and exfiltrate roughly 1 TB of patient data over four days—claims McKesson has not independently confirmed as its investigation remains in early stages.

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Unknown PaperCut NG/MF vulnerability is under active attack

PaperCut confirmed active exploitation of an unspecified NG/MF vulnerability and issued specific remediation—restrict Application Server web access to trusted IPs and hunt for truncated server.log files or suspicious pc-app.exe post-exploitation activity—while CISA added Citrix NetScaler CVE-2026-8452 to its KEV Catalog after watchTowr demonstrated root-level RCE beyond Citrix's initial DoS-only assessment, setting an August 29 federal patch deadline. Separately, the FBI and DOJ seized domains that rendered QTFY's QScan and QTRouter tools inoperable, dismantling the obfuscation network behind intrusions targeting NASA, the Federal Reserve, and the U.S. Senate.

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