All news with #stored xss tag

🛡️ Zimbra has released an urgent update to fix a critical stored cross-site scripting (XSS) vulnerability in its Classic Web Client that could permit arbitrary code execution via specially crafted emails. The vendor says the flaw could expose mailbox data, session information, or account settings if exploited, though no CVE has yet been assigned. Zimbra recommends updating to Zimbra Collaboration Suite version 10.1.19 to mitigate the risk.

🔒 Zimbra released version 10.1.19 to address a critical stored cross-site scripting (XSS) vulnerability in its Classic Web Client that can be triggered via specially crafted emails. The flaw, reported by Google's Threat Analysis Group, allows attackers to execute malicious code when messages are opened and potentially steal session data, account settings, or mailbox contents. Zimbra cautioned customers to upgrade immediately, noting the issue specifically affects Classic Web Client users, while attribution and active exploitation remain under investigation.

🔒 An independent researcher discovered a critical vulnerability in Opera GX where GX Mods auto-install on download with no permission prompt, allowing an attacker to inject CSS across all pages. This behavior enabled a zero-click XS-Leak to recover a victim's Gmail address and facilitated a DoS crash when mods were forced into private mode. The issue was reported in February, patched on May 8, and the PoC was published on July 3.

🛡️ Microsoft released updates to fix an actively exploited Exchange Server XSS vulnerability (CVE-2026-42897) that allows remote attackers to execute arbitrary JavaScript in Outlook Web Access without privileges. The flaw affects Exchange Server 2016, 2019, and Subscription Edition; Microsoft initially deployed a temporary mitigation via the Exchange Emergency Mitigation Service and now urges admins to install the June 2026 security updates and retain mitigations for added protection.

📣 A stored Cross-Site Scripting (XSS) vulnerability affects certain CP Plus 8-channel NVR 1xxx series devices due to insufficient input sanitization. Successful exploitation can execute malicious scripts in the browsers of authenticated users and administrators, risking session hijacking, unauthorized actions, and data exposure. CP Plus recommends updating device firmware to the listed version and contacting support for upgrade assistance. CISA also advises network isolation, limiting internet exposure, and following established ICS defensive practices.

⚠ Siemens SIMATIC S7 PLC web servers contain multiple cross-site scripting (XSS) vulnerabilities in their web interfaces that could allow an authenticated user with rights to download TIA projects to inject malicious scripts. Affected pages include the Communication parameters, Motion Control Diagnostics, and Firmware Update pages, where names or filenames are not properly sanitized. Siemens has published updates for several affected firmware lines—update to V2.9.9 or V3.1.6 or later where available—and is preparing further fixes. CISA republished the advisory and recommends restricting project downloads and firmware update rights, isolating devices, and applying vendor updates or compensating controls.

🔒 APT28 actors are exploiting a Zimbra Collaboration Suite stored XSS (tracked as CVE-2025-66376) in targeted attacks against Ukrainian government entities. The campaign delivers obfuscated JavaScript in phishing emails that executes when messages are opened in vulnerable Zimbra webmail, enabling remote code execution and server compromise. Researchers report the script harvests credentials, session tokens, 2FA backup codes, and 90 days of mailbox content, exfiltrating data over DNS and HTTPS. CISA has added the flaw to its catalog and ordered federal agencies to remediate affected servers under BOD 22-01.

⚠ CISA has urged federal agencies to apply patches for two actively exploited vulnerabilities affecting Synacor Zimbra Collaboration Suite and Microsoft Office SharePoint. Zimbra's Classic UI suffered a stored XSS (CVE-2025-66376) patched in versions 10.0.18 and 10.1.13 in November 2025, while SharePoint had a deserialization RCE (CVE-2026-20963) fixed in January 2026. CISA set FCEB patching deadlines and reported no public attribution or scale; separately, Amazon detailed exploitation of a Cisco firewall-management zero-day (CVE-2026-20131) by the Interlock ransomware group.

⚠️ CISA has ordered Federal Civilian Executive Branch agencies to remediate an actively exploited stored cross-site scripting vulnerability in the Zimbra Collaboration Suite, tracked as CVE-2025-66376. The flaw in the Classic UI can be abused via CSS @import directives in HTML emails by remote, unauthenticated attackers to execute arbitrary JavaScript, risking session hijack and data exfiltration. Agencies were given until April 1 under BOD 22-01, and all organizations are urged to apply vendor patches or available mitigations immediately.

⚠️ Researchers at Imperva disclosed a configuration weakness in the OAuth credential handling of n8n that fails to sanitize the authorization URL, enabling a stored XSS payload to be saved in the application database. An attacker with access to a victim's n8n instance can replace a legitimate URL with malicious JavaScript that executes when other users interact with the same credential. Because the payload is persistent, it can expose multiple OAuth credentials and enable broader system compromise. The flaw was fixed in n8n v2.6.4 on February 6.

⚠ Siemens has disclosed a stored cross-site scripting (XSS) vulnerability in Polarion V2404 and V2410 that permits authenticated remote attackers to inject JavaScript into document titles, which can execute in other users' sessions. The flaw is tracked as CVE-2025-40587 and has a CVSS v3.1 base score of 7.6 (High). Siemens advises updating to Polarion V2404.5 or later and V2410.2 or later to remediate the issue. Administrators should prioritize patching, reduce network exposure, and follow Siemens' industrial security guidance.

🔒 Ivanti released EPM 2024 SU4 SR1 to address a critical stored XSS vulnerability (CVE-2025-10573) that lets unauthenticated attackers hijack administrator sessions by submitting malicious device scan data to the incoming API. The update also fixes three high-severity flaws that can enable code execution with user interaction and an issue that permits unauthorized file writes. Ivanti said reports came through its responsible disclosure program and it was not aware of active exploitation at disclosure. Organizations with internet-facing or high-privilege EPM instances should apply the patch immediately and isolate management interfaces until updated.

⚠️ Festo SE & Co. KG's LX Appliance contains a cross-site scripting (XSS) vulnerability tied to the video.js library (CVE-2021-23414) that can allow crafted course content to execute scripts in high-privilege user sessions. The issue affects LX Appliance versions prior to June 2023 and has a CVSS v3.1 base score of 6.1. Festo coordinated disclosure with CERT@VDE and published advisory FSA-202301. Administrators should update affected appliances and apply recommended network isolation and secure remote access controls.

🔔 CISA has added CVE-2021-26829 — a cross-site scripting vulnerability in OpenPLC ScadaBR — to its Known Exploited Vulnerabilities Catalog based on evidence of active exploitation. Cross-site scripting is a frequent attack vector that can enable data theft, session hijacking, and unauthorized actions, posing significant risks to the federal enterprise. Under BOD 22-01, Federal Civilian Executive Branch agencies are required to remediate KEV-listed flaws by the specified due date; CISA also strongly urges all organizations to prioritize timely remediation. CISA will continue to update the catalog as new threats meet its criteria.

⚠ AVEVA reported a basic cross-site scripting vulnerability (CVE-2025-8386) in the Application Server IDE affecting versions 2023 R2 SP1 P02 and earlier. An authenticated user with the aaConfigTools privilege can modify App Objects' help files to persist XSS that may execute in other users' sessions, potentially enabling horizontal or vertical privilege escalation. AVEVA provides a fix in System Platform 2023 R2 SP1 P03; CISA advises auditing permissions, minimizing network exposure, and using secure remote access methods.

🔍 Forescout observed pro‑Russian hacktivist group TwoNet compromise a realistic water‑treatment honeypot in September, moving from initial access to disruptive actions in roughly 26 hours. The attackers used default credentials and SQL enumeration, then exploited a stored XSS (CVE-2021-26829) to display the message "Hacked by Barlati," altered HMI PLC setpoints and disabled real‑time updates and logs. Researchers urge strong authentication, network segmentation, IP-based ACLs for admin interfaces, and protocol-aware detection to spot exploitation and HMI changes.

⚠️A stored cross-site scripting vulnerability in the Zimbra Classic Web Client (CVE-2025-27915) was exploited in targeted attacks and has since been patched. The flaw allowed embedded JavaScript in ICS calendar entries to execute via an ontoggle event, enabling attackers to create mail filters, redirect messages, and exfiltrate mailbox data. Zimbra released fixes on January 27, 2025; administrators should apply updates and audit mailbox filters and logs for indicators of compromise.

📅 Researchers found a zero-day XSS in Zimbra Collaboration Suite exploited through malicious .ICS (iCalendar) attachments that delivered obfuscated JavaScript. The vulnerability, tracked as CVE-2025-27915, affects ZCS 9.0, 10.0 and 10.1 and was patched by Zimbra on January 27 with releases ZCS 9.0.0 P44, 10.0.13 and 10.1.5. StrikeReady determined attacks began in early January and involved a spoofed Libyan Navy email targeting a Brazilian military organization. The injected script is capable of stealing credentials, emails, contacts and shared folders, manipulating filters to forward mail, and using the Zimbra SOAP API to exfiltrate data.