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Image from The Hacker News for Critical Atlassian Flaw Lets Unauthenticated Attackers Read Known Files Across 8 Products
The Hacker NewsSecurity updates

Critical Atlassian Flaw Lets Unauthenticated Attackers Read Known Files Across 8 Products

A critical flaw in 8 Atlassian Data Center products, which customers host themselves, allows an attacker with no login access to read specific files in each product's web application root directory. The attacker must already know a file's exact name and path and cannot list what the directory holds. Atlassian disclosed the flaw, CVE-2026-21589, on October 5, rated it 9.3 out of 10, and
Read at The Hacker News
Image from Security Affairs for Anthropic Mythos Found A Bug in Rejetto HFS. Attackers Are Now Exploiting It.
Security AffairsSecurity updates

Anthropic Mythos Found A Bug in Rejetto HFS. Attackers Are Now Exploiting It.

AI-assisted research uncovered a critical Rejetto HFS flaw that enables authentication bypass and remote code execution, now exploited in the wild. A Rejetto HFS vulnerability, tracked as CVE-2026-61500 (CVSS score of 9.3), discovered with the help of the Anthropic Mythos AI model is now being exploited in the wild, turning an interesting security research experiment […]
Read at Security Affairs
Image from The Hacker News for Microsoft Exchange Flaw Lets Authenticated Attackers Read Other Users' Mailboxes
The Hacker NewsSecurity updates

Microsoft Exchange Flaw Lets Authenticated Attackers Read Other Users' Mailboxes

Microsoft has released out-of-band security updates to address a high-severity flaw in Microsoft Exchange Server that could allow an attacker to escalate privileges under certain conditions. The vulnerability, tracked as CVE-2026-96940, is rated 8.8 on the CVSS scoring system. "Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a
Read at The Hacker News
Image from Help Net Security for CISA flags new exploited NetScaler flaw as attackers crash appliances (CVE-2026-88779)
Help Net SecuritySecurity updates

CISA flags new exploited NetScaler flaw as attackers crash appliances (CVE-2026-88779)

CISA has added another Citrix NetScaler vulnerability to its Known Exploited Vulnerabilities catalog on Sunday: CVE-2026-88779, a memory overflow bug that may cripple vulnerable NetScaler ADCs and Gateways. “Citrix has observed targeted attacks on unmitigated NetScaler deployments which can lead to Denial of Service. If the condition is triggered repeatedly, the service may remain unavailable,” the vendor stated. “Our analysis indicates that this issue affects service availability, and we have not identified an impact on … More → The post CISA flags new exploited NetScaler flaw as attackers crash appliances (CVE-2026-88779) appeared first on Help Net Security.
Read at Help Net Security
Image from The Hacker News for ⚡ Weekly Recap: NetScaler and FortiMail 0-Days, AI Coding Leaks, Spectre v2 and Ransomware Arrests
The Hacker NewsSecurity updates

⚡ Weekly Recap: NetScaler and FortiMail 0-Days, AI Coding Leaks, Spectre v2 and Ransomware Arrests

A blank field. A public repo. One reply to an email. A box left exposed. None of this sounds dramatic, which is partly the problem. This week’s threats keep finding leverage in small things that were easy to overlook. There are actively exploited bugs in the mix, cleaner intrusion paths, smarter automation, and a long patch list waiting behind them. Some attacks are getting more capable. Others
Read at The Hacker News
Image from Security Affairs for U.S. CISA adds Citrix NetScaler flaw to its Known Exploited Vulnerabilities catalog
Security AffairsSecurity updates

U.S. CISA adds Citrix NetScaler flaw to its Known Exploited Vulnerabilities catalog

U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds Citrix NetScaler flaw to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added a Citrix NetScaler flaw tracked as CVE-2026-88779 (CVSS score of 8.7), to its Known Exploited Vulnerabilities (KEV) catalog. CVE-2026-88779 is a memory overflow vulnerability in Citrix NetScaler ADC and Gateway […]
Read at Security Affairs
Image from The Hacker News for Realtek Jungle SDK Exploit Attempts Deliver Cling Botnet With STUN-Based C2
The Hacker NewsSecurity updates

Realtek Jungle SDK Exploit Attempts Deliver Cling Botnet With STUN-Based C2

Threat actors have been observed attempting to exploit a now-patched critical security flaw impacting the Realtek Jungle software development kit (SDK) to deploy a botnet malware called Cling. "Cling is notable not because it introduces a new propagation technique, but because it repurposes ordinary STUN behavior into a practical command-and-control channel," Nozomi Networks said in a report
Read at The Hacker News
Image from Help Net Security for Out-of-band Exchange Server update fixes high-severity mailbox access bug (CVE-2026-96940)
Help Net SecuritySecurity updates

Out-of-band Exchange Server update fixes high-severity mailbox access bug (CVE-2026-96940)

Microsoft has pushed out an out-of-band security update for Exchange Server that fixes a high-severity vulnerability (CVE-2026-96940) that may allow authenticated attackers to read emails and attachments of other users in the same organization, but “does not allow access across tenant boundaries.” CVE-2026-96940 was discovered internally and, according to the Exchange Server Team, they “are not aware of active exploitation.” Nevertheless, Microsoft thinks that the flaw could be consistently exploited and notes that this type … More → The post Out-of-band Exchange Server update fixes high-severity mailbox access bug (CVE-2026-96940) appeared first on Help Net Security.
Read at Help Net Security
Image from The Hacker News for Attackers Target Rejetto HFS Flaw That Enables Admin Session Forgery and RCE
The Hacker NewsSecurity updates

Attackers Target Rejetto HFS Flaw That Enables Admin Session Forgery and RCE

A critical security flaw impacting Rejetto HTTP File Server (HFS) is witnessing active exploitation attempts, according to VulnCheck. The vulnerability in question is CVE-2026-61500 (CVSS score: 9.3), a case of session forgery stemming from the use of a weak pseudo-random number generator (PRNG) that can lead to a predictable key, which an attacker can then use to gain unauthorized access and
Read at The Hacker News
Image from The Hacker News for New NetScaler Zero-Day Exploited in Targeted Attacks Can Knock SAML Deployments Offline
The Hacker NewsSecurity updates

New NetScaler Zero-Day Exploited in Targeted Attacks Can Knock SAML Deployments Offline

Citrix has released security updates for a high-severity security flaw in NetScaler ADC and Citrix NetScaler Gateway that has been exploited as part of targeted zero-day attacks. The vulnerability, tracked as CVE-2026-88779, carries a CVSS score of 8.7 out of 10.0. "CVE-2026-88779 is a memory overflow vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway that can lead to
Read at The Hacker News
CISA Advisories
CISA AdvisoriesSecurity updates

CISA Adds One Known Exploited Vulnerability to Catalog

CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-88779 Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability This type of vulnerability is a frequent attack vector for malicious cyber actors and poses 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, ev
Read at CISA Advisories
Image from Help Net Security for Week in review: Researcher breaks into Microsoft analytics service, NetScaler RCE 0-day exploited
Help Net SecuritySecurity updates

Week in review: Researcher breaks into Microsoft analytics service, NetScaler RCE 0-day exploited

Here’s an overview of some of last week’s most interesting news, articles, interviews and videos: 16-year-old researcher breaks into Microsoft analytics service with access to 17 trillion rows of data A flaw in Titan, an internal Microsoft analytics service, could have let an attacker read employee records and Bing search analytics, a 16-year-old security researcher has disclosed. Citrix NetScaler RCE zero-days exploited globally for weeks (CVE-2026-88771, CVE-2026-88772) Citrix has patched eight critical and high-severity vulnerabilities … More → The post Week in review: Researcher breaks into Microsoft analytics service, NetScaler RCE 0-day exploited appeared first on Help Net Security.
Read at Help Net Security
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