CVE-2026-6820
HighCVSS 7.2Summary
The VikBooking Hotel Booking Engine & PMS plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'email' parameter in all versions up to and including 1.8.8 due to insufficient input sanitization and output escaping. This allows unauthenticated attackers to inject arbitrary web scripts that execute when a user accesses an injected page.
Risk Assessment
Unauthenticated attackers can inject arbitrary web scripts into pages, which execute whenever a user visits the compromised page. This could lead to session hijacking, redirection to malicious sites, or theft of sensitive data.
Recommendation
Immediately update the VikBooking plugin to version 1.8.9 or later, which includes a fix for this vulnerability. Additionally, consider implementing WAF rules to block suspicious data in the 'email' parameter.
Related vulnerabilities
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Pre-authentication heap overflow vulnerability in MOOS core-moos through 10.4.0 in MOOSCommPkt packet handling. Attackers can declare a negative packet length, leading to writing arbitrary data past a four-byte heap buffer during the HandShake phase.
- CVE-2026-85438Critical
Buffer overflow vulnerability in MOOS-IvP through 24.8.1 in StringToIvPFunction(), where dimension, piece, and degree counts from encoded BHV_IPF payloads are used without validation. Attackers can supply crafted payloads to write past the IvPBox weight array.
- CVE-2026-85437Critical
Multiple buffer overflow vulnerabilities in MOOS-IvP through 24.8.1 in IvP function string decoders that trust attacker-controlled length fields. Crafted encoded strings can overflow heap and stack buffers, potentially enabling remote code execution.
- CVE-2026-85435Critical
MOOS-IvP uFldNodeBroker through 24.8.1 fails to validate the source of TRY_SHORE_HOST messages, allowing any publisher to enroll attacker-controlled shore routes. Attackers can receive bridged vehicle traffic including sensor data and control information.
- CVE-2026-85434Critical
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- CVE-2026-85433Critical
MOOS essential-moos pShare through 10.0.1 fails to properly authorize PSHARE_CMD messages, allowing any publisher to reconfigure network routes and listeners at runtime. Attackers can send crafted messages to open new listeners and redirect or duplicate traffic.
- CVE-2026-85430Critical
MOOS essential-moos through 10.0.1 contains an authentication bypass in pShare that accepts UDP datagrams from any source and republishes them with attacker-claimed identity. Attackers can inject messages under spoofed identities or crash the pShare process.
- CVE-2026-85428Critical
MOOS core-moos through 10.4.0 contains an authentication bypass in the optional MOOSDB HTTP server, allowing unauthenticated clients to write variables. Attackers can modify MOOS variables including actuator and override commands without authentication.
- CVE-2026-85426Critical
MOOS-IvP uMemWatch through 24.8.1 constructs shell commands from attacker-chosen MOOS client names without sanitization. Attackers can inject shell metacharacters to execute arbitrary commands as the uMemWatch process user.
- CVE-2026-85425Critical
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Original NVD description (English source)
The VikBooking Hotel Booking Engine & PMS plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'email' parameter in all versions up to, and including, 1.8.8 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

